When Being Better Isn’t Enough...The Fall Of Slack

Logically Answered

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Video Summary

Slack, initially an accidental internal tool from a failed game studio, revolutionized business communication by offering a superior alternative to email and meetings. Its rapid growth, fueled by word-of-mouth and a user-centric approach, saw it achieve a $1.1 billion valuation in just 8 months and amass millions of daily users. However, Microsoft's entry with Teams, leveraging its Office 365 bundle, fundamentally shifted the competitive landscape, leading to Slack's struggle for survival. A key turning point was Microsoft's bundling of Teams with its widely adopted Office suite, a move Slack argued violated competition law. Despite a lengthy EU investigation and eventual separation of Teams from the bundle, Microsoft's initial strategy significantly eroded Slack's market share. Interestingly, in 2023, Slack's revenue was $1.7 billion, a 17% increase, with 47 million daily active users, indicating continued relevance in niche markets.

Short Highlights

Slack originated as an internal messaging tool for a game studio, TinySpec, before being spun out as a separate company in 2013.
Slack experienced explosive growth, reaching a $1.1 billion valuation in 8 months and becoming the fastest-growing business app, driven by its user-friendly interface, features like threaded conversations, and word-of-mouth marketing.
Microsoft initially considered buying Slack for $8 billion in 2016 but decided to build a competitor, leading to the development of Microsoft Teams.
Teams' success was significantly boosted by being bundled with Office 365, giving it millions of enterprise users overnight and creating a pricing dilemma for companies already paying for Slack.
Slack accused Microsoft of violating EU competition law by bundling Teams, blocking its removal, and making it difficult to interoperate with rival software, a complaint that took years for the EU to investigate.
In late 2020, Salesforce acquired Slack for over $27 billion, its largest acquisition ever, with the goal of integrating it into its Customer 360 platform.
Despite the acquisition and a subsequent EU ruling that forced Microsoft to unbundle Teams, Microsoft Teams remains the dominant player with 37% market share, compared to Slack's 13% in 2023.

Key Details

The Accidental Invention of Slack [00:43]

Slack's origins were unexpected, emerging from an internal communication tool developed by the game studio TinySpec.
The tool was conceived by co-founder Stuart Butterfield in 2012 after their game failed, recognizing the messaging platform's potential to solve a widespread business communication problem.
In a world reliant on email and meetings for collaboration, Slack offered a centralized, efficient solution for group messaging and file sharing.

"One of the strangest parts of this story is that Slack was sort of an accident."

Slack's Explosive Growth and User Appeal [01:44]

Launched publicly in August 2013, Slack quickly gained traction by addressing the inefficiencies of email-based collaboration.
Its user-friendly interface, features like custom emojis, robust file sharing, searchable chats, and threaded conversations contributed to its appeal among startups and small to medium-sized businesses, particularly in Silicon Valley.
Slack's growth was largely organic, relying on word-of-mouth and positive user experiences, with 8,000 users on day one and 15,000 within two weeks.

"The messaging tool was really good. It was clear to Butterfield that Slack, as it was now called, was solving a problem."

The Rise of Microsoft Teams and Competitive Pressure [07:09]

In 2016, Microsoft considered acquiring Slack for $8 billion but opted to build its own competitor, initially planning to leverage Skype.
This plan evolved into developing Microsoft Teams from the ground up, aiming to integrate it into the Office 365 suite.
Teams offered features like voice and video conferencing, and PSTN integration, addressing a weakness in Slack's offering, and crucially, it was bundled with Office 365 subscriptions.

"Microsoft had just spent $8.5 billion on Skype and it wasn't going too well."

Teams' Bundling Strategy and Slack's Response [09:53]

Microsoft's strategy of bundling Teams with Office 365 provided millions of enterprise users overnight, making it a compelling, often cost-saving, alternative for businesses already invested in the Microsoft ecosystem.
Slack responded with a full-page ad titled "Dear Microsoft," highlighting its own strengths and readiness for competition, while also preparing for a legal battle.
Slack accused Microsoft of anti-competitive practices, including forcing Teams installation, blocking its removal, and hindering interoperability with rival software, and filed a complaint with the EU.

"Microsoft didn't win people over from Slack. They were trying to kill Slack."

Salesforce Acquisition and Leadership Changes [13:32]

Facing mounting pressure and declining revenue, Slack was acquired by Salesforce in late 2020 for over $27 billion, becoming Salesforce's largest acquisition.
The integration into Salesforce's Customer 360 platform aimed to provide a strategic lifeline for Slack.
However, the acquisition was followed by the resignations of key figures, including Salesforce co-CEO Brett Taylor and Slack co-founder Stuart Butterfield, raising questions about the long-term success of the integration, partly due to the persistent strength of Microsoft 365.

"Salesforce would buy Slack for over $27 billion, their largest acquisition ever."

EU Ruling and Slack's Current Position [15:24]

In 2025, the European Commission ruled that Microsoft had violated competition law, mandating that Teams be unbundled from Office 365 for seven years in Europe.
While this ruling came years after Teams' dominant market position was established, it marked a significant victory for Slack and fair competition advocates.
Despite Microsoft's market share advantage (37% for Teams vs. 13% for Slack in 2023), Slack continues to thrive in niche markets, serving millions of daily active users and generating $1.7 billion in revenue in 2023, demonstrating its resilience.