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| 2014 (August) onwards || {{w|Slack Technologies}} era. Tiny Speck renames itself to Slack Technologies, Inc. Service collaboration consolidates with major startups such as {{w|LinkedIn}} and {{w|Dropbox}}. By 2015, Slack daily active users growth peaks. In 2017 Slack is declared the best startup of the year at the {{w|Crunchies}}.
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| 2016 and 2017 || {{w|Facebook}} and {{w|Microsoft}} launch their own products to compete with Slack. By 2017, Slack gains more than 150 Enterprise Grid customers from renowned businesses, including {{w|21st Century Fox}}, {{w|IBM}}, {{w|Capital One}}, and {{w|Liberty Mutual}}, etc.<ref>{{cite web |title=Thinking big: Slack surpasses milestone of 150 Enterprise Grid customers |url=https://www.siliconrepublic.com/enterprise/enterprise-grid-slack |website=siliconrepublic.com |accessdate=5 October 2019}}</ref>|-| 2018 || Slack surpasses 8 million users, and over 600 different software are estimated to be integrated with it.<ref name="History, Funding, Integrations">{{cite web |title=What Is Slack? History, Funding, Integrations and Direct Listing |url=https://www.getkisi.com/unlocked/what-is-slack-history-funding-integrations-and-direct-listing |website=getkisi.com |accessdate=20 October 2019}}</ref>|-| 2019 || Slack [[w:IPO|goes public]]. Daily active users exceed 10 million.<ref name="History, Funding, Integrations"/>|-
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| 2013 || August 15 || Userbase || Slack signs up 8,000 companies in 24 hours.<ref>{{cite web|last1=Koetsier|first1=John|title=Flickr founder Stewart Butterfield's new Slack signed up 8,000 companies in 24 hours|url=https://venturebeat.com/2013/08/15/flickr-founder-stewart-butterfields-new-slack-signed-up-8000-companies-in-24-hours/|website=venturebeat.com|accessdate=2 October 2017}}</ref>
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| 2014 || February || Userbase || The data for Slack's first six-month usage period since the preview release is published, showing that nearly 16,000 users were registered without the use of any form of advertising —growth was based solely upon word-of-mouth.<ref name="Mat">{{cite web|author1=Mat Honan|title=The Most Fascinating Profile You’ll Ever Read About a Guy and His Boring Startup|url=https://www.wired.com/2014/08/the-most-fascinating-profile-youll-ever-read-about-a-guy-and-his-boring-startup/|website=Wired|publisher=Condé Nast|accessdate=16 October 2017|date=7 July 2014}}</ref>
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| 2014 || February 12 || Service || Slack exits [[w:Beta release|Beta]] and goes {{w|Freemium}}.<ref>{{cite web|title=Slack, Flickr Co-Founder Butterfield’s Business Collaboration App, Exits Beta & Goes Freemium|url=https://techcrunch.com/2014/02/12/slack-exits-beta/|website=techcrunch.com|accessdate=3 October 2017}}</ref><ref>{{cite web|last1=Steele|first1=Billy|title=Flickr co-founder's Slack collaboration tool leaves beta, goes freemium for all|url=https://www.engadget.com/2014/02/12/slack-collaboration-software/|website=engadget.com|accessdate=3 October 2017}}</ref><ref>{{cite web|last1=Gannes|first1=Liz|title=Workplace Communication Hub Slack Launches to the Public|url=https://www.recode.net/2014/2/12/11623392/workplace-communication-hub-slack-launches-to-the-public|website=recode.net|accessdate=3 October 2017}}</ref><ref>{{cite web|last1=Ingram|first1=Mathew|title=Flickr co-founder launches Slack, an all-in-one messaging tool designed to kill email forever|url=https://gigaom.com/2014/02/12/flickr-co-founder-launches-slack-an-all-in-one-messaging-tool-designed-to-kill-email-forever/|website=gigaom.com|accessdate=3 October 2017}}</ref><ref>{{cite web|last1=Grant|first1=Rebecca|title=Flickr cofounder launches ’email killer’ Slack to the world|url=https://venturebeat.com/2014/02/12/flickr-cofounder-launches-email-killer-slack-to-the-world/|website=venturebeat.com|accessdate=3 October 2017}}</ref><ref>{{cite web|title=Slack exits beta with its tool for information overload|url=https://www.techworld.com/news/apps-wearables/slack-exits-beta-with-its-tool-for-information-overload-3501826/|website=techworld.com|accessdate=3 October 2017}}</ref>
| 2014 || August 28 || Rebranding || After the launch of {{w|Slack}}, {{w|Tiny Speck}} renames itself to {{w|Slack Technologies}}.<ref>{{cite web|title=Tiny Speck is no more. We're now Slack Technologies, Inc. See @SlackHQ. Bye!|url=https://twitter.com/tinyspeck/status/505049094658600961|website=twitter.com|accessdate=6 October 2017}}</ref>
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| 2014 || September 26 || Purchase Acquisition || Slacks {{w|Slack}} makes its first acquisition by purchasing bootstrapped startup Spaces, a tool that lets people work in the same document simultaneously and remotely.<ref>{{cite web|last1=Vanian|first1=Jonathan|title=Slack buys small, two-man work-collaboration startup Spaces|url=https://gigaom.com/2014/09/26/slack-buys-small-two-man-work-collaboration-startup-spaces/|website=gigaom.com|accessdate=3 October 2017}}</ref><ref>{{cite web|last1=Reader|first1=Ruth|title=Slack's product roadmap looks to Twitter, Google Docs for inspiration|url=https://venturebeat.com/2014/09/26/slacks-product-roadmap-looks-to-twitter-google-docs-for-inspiration/|website=venturebeat.com|accessdate=3 October 2017}}</ref><ref>{{cite web|last1=Sawers|first1=Paul|title=Slack makes its first acquisition, as it looks to introduce real-time collaborative document-editing|url=https://thenextweb.com/insider/2014/09/26/slack-makes-first-acquisition-looks-introduce-real-time-collaborative-document-editing/|website=thenextweb.com|accessdate=3 October 2017}}</ref><ref>{{cite web|last1=Yeung|first1=Ken|title=This Week in Tech M&A – September 26, 2014|url=https://exitround.com/week-tech-ma-september-26-2014/|website=exitround.com|accessdate=3 October 2017}}</ref><ref>{{cite web|last1=MacMillan|first1=Douglas|title=Slack Buys a Collaboration Tool in First Acquisition|url=https://blogs.wsj.com/digits/2014/09/26/slack-buys-a-collaboration-tool-in-first-acquisition/|website=wsj.com|accessdate=3 October 2017}}</ref>
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| 2014 || October 31 || Funding || Slack raises $120 million in {{w|venture capital}} with a $1.2 billion [[w:valuation (finance)|valuation]] led by {{w|Kleiner Perkins Caufield & Byers}} and {{w|Google Ventures}}. At this point, Slack is considered now the fastest-growing workplace software ever.<ref>{{cite web|title=Why Slack is worth $1bn: it's trying to change how we work|url=https://www.theguardian.com/technology/2014/nov/03/why-slack-is-worth-1bn-work-chat-app|publisher={{w|The Guardian}}|accessdate=2 October 2017|author=Alex Hern|date=3 November 2014}}</ref><ref>{{cite web|last1=Lunden|first1=Ingrid|title=Slack Confirms $120M Fundraise Led By Google Ventures And KPCB At $1.12B Valuation|url=https://techcrunch.com/2014/10/31/slack-confirms-120m-fundraise-led-by-google-ventures-and-kpcb-at-1-12b-valuation/|website=techcrunch.com|accessdate=3 October 2017}}</ref><ref>{{cite web|last1=Fiegerman|first1=Seth|title=Slack is now valued at more than $1 billion after launching less than a year ago|url=http://mashable.com/2014/10/31/slack-funding/#5i6f_p95tPqI|website=mashable.com|accessdate=3 October 2017}}</ref><ref>{{cite web|last1=Gannes|first1=Liz|title=Slack Communication Hub Raises $120 Million|url=https://www.recode.net/2014/10/31/11632502/slack-communication-hub-raises-120-million|website=recode.net|accessdate=3 October 2017}}</ref><ref>{{cite web|last1=Vanian|first1=Jonathan|title=Slack lands $120M for its collaboration software and is now a billion-dollar company|url=https://gigaom.com/2014/10/31/slack-lands-120m-for-its-collaboration-software-and-is-now-a-billion-dollar-company/|website=gigaom.com|accessdate=3 October 2017}}</ref><ref>{{cite web|last1=Newton|first1=Casey|title=Slack is now the fastest-growing workplace software ever|url=https://www.theverge.com/2014/10/31/7135639/slack-is-now-the-fastest-growing-workplace-software-ever|website=heverge.com|accessdate=3 October 2017}}</ref><ref>{{cite web|last1=MacMillan|first1=Douglas|title=Startup Slack gets $120M infusion to kill email at work|url=https://www.techworld.com/news/apps-wearables/startup-slack-gets-120m-infusion-to-kill-email-at-work-3583777/|website=wsj.com|accessdate=3 October 2017}}</ref>
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| 2017 || October 31 || Outage || Slack goes down at 3:58 PM Pacific Time (22:58 UTC), with users unable to send or receive messages or access Slack history beyond what is already cached on their local client. The outage is resolved in about two hours.<ref name=slack-status-page-2017-10-31>{{cite web|url = https://status.slack.com/2017-10-31|title = Tuesday October 31, 2017 (Status)|publisher = Slack|date = October 31, 2017|accessdate = November 1, 2017}}</ref><ref>{{cite web|url = https://techcrunch.com/2017/10/31/slack-is-still-down-and-its-past-5-oclock-so-go-home/|title = Slack is still down and it’s past 5 o’clock, so go home (Update: It’s back)|last = Coldewey|first = Devin|date = October 31, 2017|accessdate = November 1, 2017|publisher = TechCrunch}}</ref><ref>{{cite web|url = http://www.independent.co.uk/life-style/gadgets-and-tech/slack-down-broken-not-working-latest-outage-a8030526.html|title = Slack Down: Messaging Service Stops Working Across World. 'Server Error' when users attempt to access platform|last = Khan|first = Shehab|date = October 31, 2017|accessdate = November 1, 2017}}</ref>
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| 2018 || January 17 || Product || Slack releases new functionality consisting of private shared channels, with the purpose to make the service more useful for businesses dealing with confidential or classified content.<ref>{{cite web |last1=Gagliordi |first1=Natalie |title=Slack debuts private shared channels |url=https://www.zdnet.com/article/slack-debuts-private-shared-channels/ |website=zdnet.com |accessdate=5 October 2019}}</ref><ref>{{cite web |last1=Tepper |first1=Fitz |title=Planning your startup’s acquisition just got easier with Slack’s private shared channels |url=https://techcrunch.com/2018/01/17/planning-your-startups-acquisition-just-got-easier-with-slacks-private-shared-channels/ |website=techcrunch.com |accessdate=5 October 2019}}</ref>
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| 2018 || February 28 || Competition || Google releases {{w|Google Hangouts}}, a service that allows users to message each other privately or in groups, and work collaboratively on projects. Similar to Slack, it also provides other Google products such as Docs, Sheets, Slides, Calendar and Cloud Search.<ref>{{cite web |last1=Slefo |first1=George P. |title=GOOGLE TAKES AIM AT SLACK WITH NEW HANGOUTS UPDATE |url=https://adage.com/article/digital/google-takes-aim-slack-hangouts-update/312558 |website=adage.com |accessdate=5 October 2019}}</ref><ref>{{cite web |title=Google takes on Slack by adding Hangouts Chat productivity tool to G Suite |url=https://appleinsider.com/articles/18/02/28/google-takes-on-slack-by-adding-hangouts-chat-productivity-tool-to-g-suite |website=appleinsider.com |accessdate=5 October 2019}}</ref><ref>{{cite web |title=Google’s Slack competitor Hangouts Chat is launching for businesses as part of G Suite |url=https://www.theverge.com/2018/2/28/17061336/googles-g-suite-introduces-chat |website=theverge.com |accessdate=5 October 2019}}</ref>
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| 2018 || March 22 || Partnership || Slack partners with HCM platform Workday, with the purpose to merge their individual expertise to reach employees. The partnership ís expected "to allow employees to request time-off via Slack, allow real-time peer feedback, make looking up coworker info simpler and, eventually, offer customized notifications and simplified Slack channel assignments."<ref>{{cite web |title=Workday partners with Slack to provide workers real-time access to HR |url=https://www.hrdive.com/news/workday-partners-with-slack-to-provide-workers-real-time-access-to-hr/519752/ |website=hrdive.com |accessdate=5 October 2019}}</ref>
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| 2018 || April 12 || Product || Slack Enterprise Grid adds security, compliance tools, enhancing its scalability and security. The upgrades include tools for auditing and device management, in addition to onboarding features that makes it easier to add new employees to Slack channels.<ref>{{cite web |title=Slack Enterprise Grid adds security, compliance tools |url=https://searchunifiedcommunications.techtarget.com/news/252438924/Slack-Enterprise-Grid-adds-security-compliance-tools |website=searchunifiedcommunications.techtarget.com |accessdate=5 October 2019}}</ref>
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| 2018 || April 20 || Policy || Slack updates privacy policy, allowing employers to download and read direct messages sent between co-workers without telling them.<ref>{{cite web |title=Slack updates privacy policy: Employers can read 'private' DMs without telling workers |url=https://www.nbcnews.com/better/business/slack-updates-privacy-policy-employers-can-read-private-dms-without-ncna862811 |website=nbcnews.com |accessdate=5 October 2019}}</ref><ref>{{cite web |title=Slack competitor Spectrum released as open source group messaging platform |url=https://www.techrepublic.com/article/slack-competitor-spectrum-released-as-open-source-group-messaging-platform/ |website=techrepublic.com |accessdate=5 October 2019}}</ref><ref>{{cite web |title=Update to Slack Privacy Policy Allows Employers to Read DM's |url=https://www.nbcphiladelphia.com/news/tech/Updates-to-Slack-Privacy-Policy--478860473.html |website=nbcphiladelphia.com |accessdate=5 October 2019}}</ref>
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| 2018 || May 8 || Userbase || Slack reports 8 million daily active users and 3 million paid users.<ref name="">{{cite web |title=Slack hits 8 million daily active users with 3 million paid users |url=https://techcrunch.com/2018/05/08/slack-hits-8-million-daily-active-users-with-3-million-paid-users/ |website=techcrunch.com |accessdate=6 October 2019}}</ref><ref>{{cite web |title=SLACK REPORTS 8 MILLION DAILY ACTIVE USERS, 3 MILLION PAID USERS |url=https://betakit.com/slack-reports-8-million-daily-active-users-3-million-paid-users/ |website=betakit.com |accessdate=6 October 2019}}</ref><ref>{{cite web |title=Slack hits 8 million daily users, with 3 million paid subscribers |url=https://www.geekwire.com/2018/slack-hits-8-million-daily-users-3-million-paid-subscribers/ |website=geekwire.com |accessdate=6 October 2019}}</ref><ref>{{cite web |title=Slack touts 8M users as team collaboration competition intensifies |url=https://www.computerworld.com/article/3271425/slack-touts-8m-users-as-team-collaboration-competition-intensifies.html |website=computerworld.com |accessdate=6 October 2019}}</ref>
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| 2018 || May 22 || Product || Slack introduces Actions, a set of new developer tools, to make it easier to create and finish tasks without leaving. Developers including {{w|Asana}}, {{w|Jira}}, Pocket, and {{w|Zendesk}} have newly integrated “action buttons” letting users perform actions on those services directly from Slack messages.<ref>{{cite web |title=Slack introduces Actions to make it easier to create and finish tasks without leaving |url=https://techcrunch.com/2018/05/22/slack-introduces-actions-to-make-it-easier-to-create-and-finish-tasks-without-leaving/ |website=techcrunch.com |accessdate=5 October 2019}}</ref><ref>{{cite web |last1=Gagliordi |first1=Natalie |title=Slack's new Actions tool turns messages into tasks |url=https://www.zdnet.com/article/slacks-new-actions-tool-turns-messages-into-tasks/ |website=zdnet.com |accessdate=5 October 2019}}</ref><ref>{{cite web |last1=Finnegan |first1=Matthew |title=Slack adds Actions feature, highlights dev community growth |url=https://www.computerworld.com/article/3273710/slack-adds-actions-feature-highlights-dev-community-growth.html |website=computerworld.com |accessdate=5 October 2019}}</ref><ref>{{cite web |last1=Newton |first1=Casey |title=Slack adds action buttons to become a true workplace communication hub |url=https://www.theverge.com/2018/5/22/17378228/slack-action-buttons-asana-jira-bitbucket-developer-conference |website=theverge.com |accessdate=5 October 2019}}</ref>
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| 2018 || July 12 || Competition || {{w|Microsoft}} releases a free version of {{w|Microsoft Teams}}, the company’s Slack competitor. The free version is expected to include support for up to 300 people, with unlimited chat messages and search, whereas Slack’s free version is limited to 10,000 searchable messages, 10 app integrations, 5GB of file storage, no guest accounts, and only 1:1 video chats.<ref>{{cite web |title=Microsoft has Slack in its sights, offers its Teams chat for free |url=https://www.cnet.com/news/microsoft-has-slack-in-its-sights-is-offering-its-teams-chat-for-free/ |website=cnet.com |accessdate=6 October 2019}}</ref><ref>{{cite web |title=Microsoft has Slack in its sights, offers its Teams chat for free |url=https://www.cnet.com/news/microsoft-has-slack-in-its-sights-is-offering-its-teams-chat-for-free/ |website=cnet.com |accessdate=6 October 2019}}</ref><ref>{{cite web |title=By going free, Microsoft Teams is taking on Slack more directly |url=https://www.fastcompany.com/90201021/by-going-free-microsoft-teams-is-taking-on-slack-more-directly |website=fastcompany.com |accessdate=6 October 2019}}</ref><ref>{{cite web |title=Microsoft challenges Slack with a free version of Microsoft Teams |url=https://www.pcworld.com/article/3289111/microsoft-makes-a-free-version-of-microsoft-teams.html |website=pcworld.com |accessdate=6 October 2019}}</ref>
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| 2018 || July 17 || Acquisition || Slack acquires Robots and Pencils’ app Missions, a tool aimed at facilitating users to automate routine processes and tasks in Slack.<ref>{{cite web |last1=Matney |first1=Lucas |title=Slack acquires Missions to help users automate work tasks inside chat |url=https://techcrunch.com/2018/07/17/slack-acquires-missions-to-help-users-automate-work-tasks-inside-chat/ |website=techcrunch.com |accessdate=6 October 2019}}</ref><ref>{{cite web |title=Slack acquires Robots & Pencils’ Missions to make it easy for non-tech teams to streamline work |url=https://slackhq.com/slack-acquires-robot-pencils-missions-to-make-it-easy-for-non-tech-teams-to-streamline-work |website=slackhq.com |accessdate=6 October 2019}}</ref><ref>{{cite web |title=Slack acquires Missions to help teams streamline workplace processes |url=https://venturebeat.com/2018/07/17/slack-acquires-missions-to-help-teams-streamline-workplace-processes/ |website=venturebeat.com |accessdate=6 October 2019}}</ref><ref>{{cite web |title=What the Missions acquisition means for Slack developers |url=https://medium.com/slack-developer-blog/what-the-missions-acquisition-means-for-slack-developers-c96aabd12ee2 |website=medium.com |accessdate=6 October 2019}}</ref>
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| 2018 || July 27 || Acquisition || Slack acquires from {{w|Atlassian}} workplace chat app HipChat, with plans to shut it down and migrate users to its chat service. It also acquires Atlassian’s Stride, a successor to Hipchat tool.<ref>{{cite web |title=Slack buys HipChat with plans to shut it down and migrate users to its chat service |url=https://www.theverge.com/2018/7/26/17619482/slack-hipchat-acquisition-stride-atlassian-partnership-microsoft-teams-competition |website=theverge.com |accessdate=6 October 2019}}</ref><ref>{{cite web |last1=Kumparak |first1=Greg |title=Atlassian’s HipChat and Stride to be discontinued, with Slack buying up the IP |url=https://techcrunch.com/2018/07/26/atlassians-hipchat-and-stride-to-be-discontinued-with-slack-buying-up-the-ip/ |website=techcrunch.com |accessdate=6 October 2019}}</ref><ref>{{cite web |title=$5 billion Slack just swallowed one of its biggest rivals as it rallies against Microsoft |url=https://www.businessinsider.com/atlassian-sell-hipchat-slack-2018-7 |website=businessinsider.com |accessdate=6 October 2019}}</ref><ref>{{cite web |title=Atlassian move to ditch Stride and Hipchat in Slack deal angers users |url=https://www.computerworld.com/article/3293402/atlassian-move-to-ditch-stride-and-hipchat-in-slack-deal-angers-users.html |website=computerworld.com |accessdate=6 October 2019}}</ref>
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| 2018 || August 21 || Funding || Slack announces having raised US$427 million in a Series H round, reaching value at over $7.1 billion. The funding is led by Dragoneer Investment Group and General Atlantic.<ref>{{cite web |title=Slack confirms it has raised $427M at a post-money valuation of over $7.1B |url=https://techcrunch.com/2018/08/21/slack-confirms-it-has-raised-427m-at-a-post-money-valuation-of-over-7-1b/ |website=techcrunch.com |accessdate=6 October 2019}}</ref><ref>{{cite web |title=Slack’s valuation tops $7.1 billion as venture investors keep piling into the messaging app |url=https://www.cnbc.com/2018/08/20/slack-raises-427-million-funding-round-at-7point1-billion-valuation.html |website=cnbc.com |accessdate=6 October 2019}}</ref><ref>{{cite web |title=Slack just raised a whopping $427 million to become a $7.1 billion company. Now it has to defeat Microsoft. |url=https://www.businessinsider.com/slack-funding-valuation-microsoft-teams-2018-8 |website=businessinsider.com |accessdate=6 October 2019}}</ref>
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| 2018 || August 30 || Product || Slack updates its status feature to include an expiration date, allowing users to set certain statuses like commuting, meetings, and vacation to expire after a distinct amount of time.<ref>{{cite web |title=Slack quietly adds auto-expiring statuses |url=https://www.theverge.com/2018/8/30/17802308/slack-auto-expiring-status-updates-feature-change |website=theverge.com |accessdate=6 October 2019}}</ref><ref>{{cite web |title=Slack Raises $427 Million More, at $7.1 Billion Valuation |url=https://www.nytimes.com/2018/08/21/business/dealbook/slack-fund-raising-round.html |website=nytimes.com |accessdate=6 October 2019}}</ref>
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| 2018 || September 24 || Acquisition || Slack acquires {{w|San Francisco}}-based email management startup Astro Technology, with the purpose to unify chat and email features.<ref>{{cite web |last1=Heater |first1=Brian |title=Slack acquires Astro to conquer email |url=https://techcrunch.com/2018/09/24/slack-acquires-astro-to-conquer-email/ |website=techcrunch.com |accessdate=6 October 2019}}</ref><ref>{{cite web |title=Slack acquires Astro to help email and channels work together |url=https://slackhq.com/slack-acquires-astro-to-help-email-and-channels-work-together |website=slackhq.com |accessdate=6 October 2019}}</ref><ref>{{cite web |title=Slack Acquires Astro Technology to Streamline Chat and Email |url=http://www.kmworld.com/Articles/News/News/Slack-Acquires-Astro-Technology-to-Streamline-Chat-and-Email-127704.aspx |website=kmworld.com |accessdate=6 October 2019}}</ref>
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| 2018 || December 20 || User expulsion || A number of Slack users related to countries embargoed by the United States have their accounts deactivated and their free access revoked. The ban is reported by Slack to comply with US regulations, which even affects users who have visited nations including Iran and North Korea. Any travel to these countries (and the associated {{w|IP address}}) are found sufficient to flag an account under Slack’s new geolocation update triggering the bans. The company states “Slack complies with the U.S. regulations related to embargoed countries and regions. As such, we prohibit unauthorized Slack use in Cuba, Iran, North Korea, Syria and the Crimea region of Ukraine.”<ref>{{cite web |last1=Hatmaker |first1=Taylor |title=Slack shuts down accounts belonging to Iranian expats and users who visited Iran |url=https://techcrunch.com/2018/12/20/slack-iran/ |website=techcrunch.com |accessdate=6 October 2019}}</ref><ref>{{cite web |title=Slack is banning users who have visited U.S.-sanctioned countries while using its app |url=https://mashable.com/article/slack-banning-users-from-iran-cuba-sanctioned-countries/ |website=mashable.com |accessdate=6 October 2019}}</ref><ref>{{cite web |title=Slack Bans Iranian Academic Living in Canada Because of Sanctions |url=https://www.vice.com/en_us/article/bjek8w/slack-bans-iranian-academic-sanctions |website=vice.com |accessdate=6 October 2019}}</ref><ref>{{cite web |title=It looks like Slack, the $7 billion chat app, is banning some users because of Iran sanctions — even if they don't live or work in Iran |url=https://www.businessinsider.com/slack-bans-users-because-of-sanctions-even-if-they-dont-live-in-iran-2018-12 |website=businessinsider.com |accessdate=6 October 2019}}</ref> Later, the company would apologize for 'mistakenly' banning visitors to these countries.<ref>{{cite web |title=Slack apologizes after users who travelled to Iran had their accounts shut down |url=https://www.businessinsider.com/slack-apologizes-after-iranian-users-found-their-accounts-shut-down-2018-12 |website=businessinsider.com |accessdate=6 October 2019}}</ref><ref>{{cite web |title=Slack apologizes|url=https://9to5mac.com/2018/12/22/slack-iran-deactivating-accounts/ |website=9to5mac.com |accessdate=6 October 2019}}</ref>
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| 2019 || January 16 || Product || Slack introduces new logo, and announces redesign of other elements of its website, marketing materials, and "some places in the product" in the coming months to align with the new design.<ref>{{cite web |title=SLACK'S NEW LOGO GETS RIPPED BY USERS: 'COLORFUL SWASTIKA' |url=https://www.newsweek.com/slack-new-logo-redesign-swastika-twitter-1295161 |website=newsweek.com |accessdate=9 October 2019}}</ref><ref>{{cite web |title=Slack has a new logo and it's ... fine |url=https://mashable.com/article/slack-redesigned-new-logo/ |website=mashable.com |accessdate=9 October 2019}}</ref><ref>{{cite web |title=Behold, Slack’s new logo |url=https://techcrunch.com/2019/01/16/behold-slacks-new-logo/ |website=techcrunch.com |accessdate=9 October 2019}}</ref>
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| 2019 || January 29 || Userbase || Slack reports more than 10 million daily active users, up from 8 million in May 2018. At least 85,000 organizations use the service to help employees communicate with each other.<ref>{{cite web |title=Slack now has more than 10 million daily active users |url=https://techcrunch.com/2019/01/29/slack-now-has-more-than-10-million-daily-active-users/ |website=techcrunch.com |accessdate=9 October 2019}}</ref><ref>{{cite web |title=Slack passes 10 million daily active users |url=https://venturebeat.com/2019/01/29/slack-passes-10-million-daily-active-users/ |website=venturebeat.com |accessdate=9 October 2019}}</ref><ref>{{cite web |title=Email rival Slack says it has 10 million daily active users |url=https://www.reuters.com/article/us-slack-users/email-rival-slack-says-it-has-10-million-daily-active-users-idUSKCN1PN2T2 |website=reuters.com |accessdate=9 October 2019}}</ref>
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| 2019 || February 4 || Financial || Slack announces having confidentially applied with the {{w|U.S. Securities and Exchange Commission}} to list shares publicly, moving the company a step closer to going public.<ref>{{cite web |title=Slack makes confidential filing to go public |url=https://www.reuters.com/article/us-slack-ipo/slack-makes-confidential-filing-for-ipo-idUSKCN1PT1T8 |website=reuters.com |accessdate=9 October 2019}}</ref><ref>{{cite web |title=Slack confidentially files to go public |url=https://edition.cnn.com/2019/02/04/tech/slack-ipo-filing/index.html |website=edition.cnn.com |accessdate=9 October 2019}}</ref><ref>{{cite web |title=Message Platform Slack Moves Ahead Amid Direct Listing Plans |url=https://www.bloomberg.com/news/articles/2019-02-04/messaging-platform-provider-slack-says-it-s-filed-to-go-public |website=bloomberg.com |accessdate=9 October 2019}}</ref><ref>{{cite web |title=Slack to go public in one of the first major IPOs of 2019 |url=https://qz.com/1541844/slack-to-go-public-in-one-of-the-first-major-silicon-valley-ipos-of-2019/ |website=qz.com |accessdate=9 October 2019}}</ref>
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| 2019 || February 5 || Competition || Private, open source Slack competitor {{w|Mattermost}} raises US$20 million in Series A Funding for its workplace chat app. As of date, Mattermost is the fastest growing messaging platform for engineering teams at large organizations.<ref>{{cite web |title=Slack competitor Mattermost raises $20 million for its workplace chat app |url=https://venturebeat.com/2019/02/05/slack-competitor-mattermost-raises-20-million-for-its-workplace-chat-app/ |website=venturebeat.com |accessdate=9 October 2019}}</ref><ref>{{cite web |title=Mattermost Raises $20 Million Series A Funding to Bring High-Trust Messaging to Security-Conscious Enterprises |url=https://www.globenewswire.com/news-release/2019/02/05/1710577/0/en/Mattermost-Raises-20-Million-Series-A-Funding-to-Bring-High-Trust-Messaging-to-Security-Conscious-Enterprises.html |website=globenewswire.com |accessdate=9 October 2019}}</ref>
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| 2019 || February 28 || Competition || Facebook announces two million paid users of its Slack rival 'Workplace' service, an enterprise-oriented version of the social network that, instead of distracting workers, lets them connect and collaborate.<ref>{{cite web |title=Facebook says that Workplace now has 2M paying users |url=https://techcrunch.com/2019/02/28/facebook-says-that-workplace-now-has-2m-paying-users/ |website=techcrunch.com |accessdate=9 October 2019}}</ref><ref>{{cite web |title=Workplace by Facebook passes 2 million paid users |url=https://venturebeat.com/2019/02/28/workplace-by-facebook-now-has-2-million-paid-users/ |website=venturebeat.com |accessdate=9 October 2019}}</ref><ref>{{cite web |title=Facebook's 'Workplace' claims two million users |url=https://phys.org/news/2019-02-facebook-workplace-million-users.html |website=phys.org |accessdate=9 October 2019}}</ref>
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| 2019 || March 11 || Product || Slack releases a dark mode feature in the latest app update for {{w|iOS}} and [[w:Android (operating system)|Android]], adding one of the most commonly requested features for any application.<ref>{{cite web |title=How to turn on Slack’s dark mode on iOS and Android |url=https://thenextweb.com/apps/2019/03/12/how-to-turn-on-slacks-dark-mode-on-ios-and-android/ |website=thenextweb.com |accessdate=9 October 2019}}</ref><ref>{{cite web |title=Dark mode comes out of beta in Slack’s latest update for iOS and Android |url=https://www.theverge.com/2019/3/11/18260488/slack-dark-mode-ios-android-mobile-out-of-beta |website=theverge.com |accessdate=9 October 2019}}</ref><ref>{{cite web |title=Slack adds dark mode to its iOS, Android apps |url=https://www.cnet.com/news/slack-adds-dark-mode-to-its-ios-android-apps/ |website=cnet.com |accessdate=9 October 2019}}</ref><ref>{{cite web |title=If You Must Use Slack on Your Phone, Why Not Do It in Dark Mode? |url=https://gizmodo.com/if-you-must-use-slack-on-your-phone-why-not-do-it-in-d-1833180527 |website=gizmodo.com |accessdate=9 October 2019}}</ref>
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| 2019 || March 14 || User expulsion || Slack announces removal of 28 accounts with a “clear affiliation with known hate groups.” The announcement comes after leaked Slack messages show members of American {{w|neo-Nazi}} group {{w|Identity Evropa}} organizing meet-ups and plans to distribute fliers promoting their “white racial consciousness” organization in cities across the United States.<ref>{{cite web |title=Slack removes 28 accounts linked to hate groups |url=https://techcrunch.com/2019/03/14/slack-hate-groups/ |website=techcrunch.com |accessdate=9 October 2019}}</ref><ref>{{cite web |title=Slack says it removed dozens of accounts affiliated with hate groups |url=https://www.theverge.com/2019/3/14/18265796/slack-removes-accounts-hate-groups-moderation-chat |website=theverge.com |accessdate=9 October 2019}}</ref><ref>{{cite web |title=Slack removed 28 accounts with ties to hate groups |url=https://www.engadget.com/2019/03/14/slack-removed-28-accounts-with-ties-to-hate-groups/ |website=engadget.com |accessdate=9 October 2019}}</ref><ref>{{cite web |title=FIRST AT TPM: Slack Deletes Hate Group Accounts After Leaks Of Private Chats |url=https://talkingpointsmemo.com/muckraker/slack-removes-hate-group-accounts-leaks-identity-evropa-chats |website=talkingpointsmemo.com |accessdate=9 October 2019}}</ref>
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| 2019 || March 18 || Product || Slack introduces enterprise key management (EKM), a feature that allows businesses to better secure sensitive stored data, including messages, files and comments. This new tool enables customers to control their encryption keys in the enterprise version of Slack.<ref>{{cite web |title=Slack launches encryption keys so businesses can protect their data |url=https://venturebeat.com/2019/03/18/slack-launches-encryption-keys-so-businesses-can-protect-their-data/ |website=venturebeat.com |accessdate=9 October 2019}}</ref><ref>{{cite web |title=Slack rolls out enterprise key management, but has no plans for end-to-end encryption |url=https://www.computerworld.com/article/3368503/slack-rolls-out-enterprise-key-management-but-has-no-plans-for-end-to-end-encryption.html |website=computerworld.com |accessdate=9 October 2019}}</ref><ref>{{cite web |title=Slack launches Enterprise Key Management, a tool that gives admins control over encryption keys |url=https://www.zdnet.com/article/slack-launches-enterprise-key-management-a-tool-that-gives-admins-control-over-encryption-keys/ |website=zdnet.com |accessdate=9 October 2019}}</ref><ref>{{cite web |title=Slack hands over control of encryption keys to regulated customers |url=https://techcrunch.com/2019/03/18/slack-hands-over-encryption-keys-to-regulated-customers/ |website=techcrunch.com |accessdate=9 October 2019}}</ref>
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| 2019 || April 26 || Financial || Slack files to go public via a direct listing, which excludes a traditional {{w|IPO}}, instead allowing existing shareholders to sell their stock to investors.<ref>{{cite web |title=Slack files to go public with an unusual approach |url=https://edition.cnn.com/2019/04/26/tech/slack-files-to-go-public/index.html |website=edition.cnn.com |accessdate=9 October 2019}}</ref><ref>{{cite web |title=Slack files to go public, reports $138.9M in losses on revenue of $400.6M |url=https://techcrunch.com/2019/04/26/slack-files-to-go-public/ |website=techcrunch.com |accessdate=9 October 2019}}</ref><ref>{{cite web |title=Slack Discloses $141 Million Loss as Messaging Start-Up Joins Tech Listing Rush |url=https://www.nytimes.com/2019/04/26/technology/slack-filing.html |website=nytimes.com |accessdate=9 October 2019}}</ref><ref>{{cite web |title=Slack IPO Filing Shows Sharp Revenue Growth but Continued Losses |url=https://www.wsj.com/articles/slack-files-to-go-public-via-direct-listing-11556285357 |website=wsj.com |accessdate=9 October 2019}}</ref>
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| 2019 || April 24 || Product || Slack introduces update allowing customers to connect with other users, even if they don't use the app itself. Users can send a Slack message straight to someone's email. The recipient can then join the Slack conversation, or reply via email.<ref>{{cite web |title=Slack, the hot workplace chat app, launches new ways to integrate with email ahead of its much-anticipated IPO |url=https://www.businessinsider.com/slack-new-updates-send-messages-non-slack-users-email-2019-4 |website=businessinsider.com |accessdate=9 October 2019}}</ref><ref>{{cite web |title=Slack to extend collaboration to folks who don’t want to give up email |url=https://techcrunch.com/2019/04/24/slack-to-extend-collaboration-to-folks-who-dont-want-to-give-up-email/ |website=techcrunch.com |accessdate=9 October 2019}}</ref><ref>{{cite web |title=Messaging Startup Slack Is Expected to File Listing Prospectus This Week |url=https://www.wsj.com/articles/messaging-startup-slack-is-expected-to-file-listing-prospectus-this-week-11556143120 |website=wsj.com |accessdate=9 October 2019}}</ref>
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| 2019 || June 20 || Financial || Slack {{w|IPO}} starts trading at US$38.50 per share, giving the company a US$23 billion valuation, well above the expected $16 billion. The company becomes the second large venture capital-backed business to complete a direct listing, instead of an initial public offering. This alternative path to the public markets allows businesses to go public without selling new shares of its stock.<ref>{{cite web |title=Slack IPO starts trading at $38.50 for $23 billion valuation |url=https://venturebeat.com/2019/06/20/slack-ipo-starts-trading-at-38-50-for-23-billion-valuation/ |website=venturebeat.com |accessdate=9 October 2019}}</ref><ref>{{cite web |title=Slack’s value rockets as stock closes up 48.5% in public debut |url=https://techcrunch.com/2019/06/20/slacks-value-rockets-as-stock-closes-up-48-5-in-public-debut/ |website=techcrunch.com |accessdate=9 October 2019}}</ref><ref>{{cite web |title=Slack reference price for direct listing set at $26/share |url=https://www.reuters.com/article/us-slack-listing-reference-price/slack-reference-price-for-direct-listing-set-at-26-share-idUSKCN1TK31V |website=reuters.com |accessdate=9 October 2019}}</ref><ref>{{cite web |title=Slack is a 'very significant' company: IPO ETF manager |url=https://sports.yahoo.com/slack-is-a-very-significant-company-ipo-etf-manager-195502358.html |website=sports.yahoo.com |accessdate=9 October 2019}}</ref>
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| 2019 || June 22 || Competition || {{w|Microsoft}} adds Slack to its list of “prohibited and discouraged technology”, and bans its employees from using the chat app for security reasons, instead encouraging them to to use the Microsoft Teams app.<ref>{{cite web |title=Microsoft reportedly bans its employees from using Slack for security reasons and encourages them to to use the Microsoft Teams app instead |url=https://www.businessinsider.com/microsoft-reportedly-bans-employees-from-using-slack-2019-6 |website=businessinsider.com |accessdate=9 October 2019}}</ref><ref>{{cite web |title=Microsoft bans Slack and discourages AWS and Google Docs use internally |url=https://www.theverge.com/2019/6/22/18713270/microsoft-slack-ban-aws-google-docs-prohibited-list-details |website=theverge.com |accessdate=9 October 2019}}</ref><ref>{{cite web |title=Microsoft Bans Employees From Using Slack, Has AWS and Google Docs on a 'Discouraged' List |url=https://gizmodo.com/microsoft-bans-employees-from-using-slack-has-aws-and-1835770652 |website=gizmodo.com |accessdate=9 October 2019}}</ref><ref>{{cite web |title=Microsoft thinks Slack not secure enough, prohibits internal use |url=https://www.digitaltrends.com/computing/microsoft-reportedly-prohibits-employees-from-using-slack/ |website=digitaltrends.com |accessdate=9 October 2019}}</ref>
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| 2019 || July 11 || Competition || {{w|Microsoft Teams}} reports more than 13 million daily users, along with more than 19 million weekly active users. This figure surpasses the more than 10 million people who use Slack daily.<ref>{{cite web |title=Microsoft Teams overtakes Slack with 13 million daily users |url=https://www.theverge.com/2019/7/11/20689143/microsoft-teams-active-daily-users-stats-slack-competition |website=theverge.com |accessdate=9 October 2019}}</ref><ref>{{cite web |title=Microsoft Teams is now officially bigger than Slack |url=https://arstechnica.com/gadgets/2019/07/microsoft-teams-is-now-officially-bigger-than-slack/ |website=arstechnica.com |accessdate=9 October 2019}}</ref><ref>{{cite web |title=Microsoft says Teams now has 13M daily active users |url=https://techcrunch.com/2019/07/11/microsoft-says-its-slack-competitor-teams-now-has-13-million-daily-active-users/ |website=techcrunch.com |accessdate=9 October 2019}}</ref><ref>{{cite web |title=Microsoft says its Teams app is bigger than Slack and growing faster |url=https://www.cnbc.com/2019/07/11/microsoft-teams-passes-slack-in-daily-users-rajesh-jha-explains-why.html |website=cnbc.com |accessdate=9 October 2019}}</ref>
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| 2019 || August 6 || Product || Slack releases a number of updates with the purpose to provide a secure way for businesses to share and collaborate online. Among the updates there's the ability for administrators to require {{w|Touch ID}} or {{w|Face ID}} or to enter a passcode on a mobile device. In addition, administrators can wipe Slack conversations remotely if a user reports a device stolen.<ref>{{cite web |title=Slack makes some key security enhancements |url=https://techcrunch.com/2019/08/06/slack-makes-some-key-security-enhancements/ |website=techcrunch.com |accessdate=10 October 2019}}</ref><ref>{{cite web |title=Slack ups security to keeps your chats protected |url=https://www.techradar.com/au/news/slack-ups-security-to-keeps-your-chats-protected |website=techradar.com |accessdate=10 October 2019}}</ref><ref>{{cite web |title=Slack now supports Face ID and Touch ID for two-factor authentication |url=https://venturebeat.com/2019/08/06/slack-now-supports-face-id-and-touch-id-for-two-factor-authentication/ |website=venturebeat.com |accessdate=10 October 2019}}</ref><ref>{{cite web |title=Slack's new security features give enterprise admins more control over data |url=https://www.techrepublic.com/article/slacks-new-security-features-give-enterprise-admins-more-control-over-data/ |website=techrepublic.com |accessdate=10 October 2019}}</ref>
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| 2019 || August 14 || Product || Slack introduces admin workflow automation and announcement channels aimed at larger organizations, facilitating administrators to limit how employees talk to each other with notification channels that form a new kind of Slack chat space. Ability is introduced for administrators to designate any channel to be used for announcements only, a move aimed at minimizing distractions and ensuring that important information is communicated to workers.<ref>{{cite web |title=Slack announces new admin features for larger organizations |url=https://techcrunch.com/2019/08/14/latest-slack-features-are-geared-towards-admins-in-large-organizations/ |website=techcrunch.com |accessdate=10 October 2019}}</ref><ref>{{cite web |title=Slack launches admin workflow automation and announcement channels |url=https://venturebeat.com/2019/08/14/slack-launches-admin-workflow-automation-and-announcement-channels/ |website=venturebeat.com |accessdate=10 October 2019}}</ref><ref>{{cite web |title=Slack touts ‘announcement channels’ for team update broadcasts |url=https://www.computerworld.com/article/3431857/slack-touts-announcement-channels-to-broadcast-team-updates.html |website=computerworld.com |accessdate=10 October 2019}}</ref>
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| 2019 || September 12 || Product || Slack introduces dark mode on [[w:Desktop computer|desktop]] for [[w:Microsoft Windows|Windows]], {{w|macOS}}, and {{w|Linux}} users.<ref>{{cite web |title=Slack launches dark mode for macOS, Windows, and Linux |url=https://www.theverge.com/2019/9/12/20862234/slack-dark-mode-macos-windows-linux-desktop-features |website=theverge.com |accessdate=10 October 2019}}</ref><ref>{{cite web |title=How to enable dark mode in Slack on your desktop |url=https://thenextweb.com/basics/2019/09/13/how-to-enable-dark-mode-in-slack-on-your-desktop/ |website=thenextweb.com |accessdate=10 October 2019}}</ref>
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