Microsoft Teams vs. Slack in 2026: Which Team Messaging App Should You Use?

# Microsoft Teams vs. Slack in 2026: Which Team Messaging App Should You Use?

By Daniel Rozin | A Versus B | May 14, 2027

Microsoft Teams has 320 million daily active users. Slack has approximately 40 million daily active users. Teams' scale advantage is driven almost entirely by Microsoft 365 bundling — it's included in every Microsoft 365 Business and Enterprise subscription, making it the default choice for companies already using Office. The better question isn't which is bigger, but which is better for your specific team.

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Pricing#

Microsoft Teams#

Key point: If your company already subscribes to Microsoft 365 Business Basic ($6/user/mo or higher), Teams is already included at no additional cost. For most businesses, Teams costs $0 incremental to their existing Microsoft spend.

Slack#

Slack Pro costs $7.25/user/month — more expensive than Teams Essentials ($4/user/mo) and comparable to Microsoft 365 Business Basic ($6/user/mo) which includes Teams plus a full productivity suite.

Pricing verdict: For companies with Microsoft 365, Teams is effectively free. For companies without Microsoft 365, Slack Pro ($7.25) is comparable to or slightly more expensive than Teams Essentials ($4).

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Core Features Compared#

Messaging and Channels#

Both platforms support channels, direct messages, group messages, threads, and reactions. The experience is similar.

Slack advantages:

• Better keyboard shortcuts and power-user navigation
• Superior search (full-text search across messages, files, and threads is faster and more accurate)
• Huddles (lightweight audio/video for quick calls directly in the app, without scheduling)
• Workflow Builder (no-code automation for common message-triggered actions)

Teams advantages:

• "Teams" (group workspaces) vs. "channels" — the hierarchy is different but both serve the same purpose
• Persistent chat in the sidebar accessible across devices
• Better at managing large organizations with many teams and channels (enterprise-grade governance)

Video Conferencing#

Microsoft Teams has the best-in-class video conferencing for enterprise:

• 1,000 participants in meetings, 10,000 in webinars, 20,000 in live events
• Together Mode (virtual background that places participants in shared virtual space — genuinely reduces meeting fatigue)
• Teams Rooms (hardware + software for conference room setups, deep AV integration)
• Teams Phone (licensed phone system for replacing traditional PBX)

Slack acquired Slack Video (via acquisition) and offers:

• Huddles (up to 50 participants for audio/video)
• Clips (async video messages)
• But no enterprise-grade webinar/event infrastructure

Verdict: Teams is significantly better for video conferencing, especially for large enterprise meetings, webinars, and conference room hardware.

File Sharing and Storage#

Teams integrates natively with SharePoint and OneDrive. Files shared in a Teams channel are stored in the corresponding SharePoint site. Files shared in a chat are stored in OneDrive. This means:

• Files are version-controlled natively (SharePoint versioning)
• Files are accessible via the SharePoint/OneDrive web interface outside Teams
• IT admins have granular permission management through Microsoft's existing compliance tools

Slack stores files on Slack's own infrastructure and integrates with Google Drive, Dropbox, Box, and OneDrive. For Microsoft 365 shops, the SharePoint integration in Teams is stronger than what Slack can offer through connectors.

App Integrations#

Slack wins here. Slack's app ecosystem has over 2,600 integrations. The developer workflow integrations are best-in-class:

Teams has a robust app store (~700 apps) but the third-party integrations for developer tools are generally better maintained and more deeply integrated on Slack.

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Who Should Use Microsoft Teams#

• Companies already on Microsoft 365 (Teams is included, zero incremental cost)
• Large enterprises (better governance, compliance, and administrative tools)
• Companies that run meetings frequently (superior video conferencing)
• Companies using Teams Phone (replacing traditional phone systems)
• Organizations requiring SharePoint/OneDrive deep integration

Who Should Use Slack#

• Startups and tech companies (better developer tool integrations)
• Companies using Google Workspace (Google Drive integration, no Microsoft dependency)
• Teams where async communication is primary (Slack's UX and search are better for this)
• Developer-heavy teams (GitHub, Jira, PagerDuty integrations)
• Companies that prioritize UX over enterprise features

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The Honest Verdict#

Microsoft Teams is the default choice for most companies, simply because it comes with Microsoft 365. The integration with Outlook, SharePoint, OneDrive, and Teams Calling is unmatched, and paying for Slack on top of an existing Microsoft 365 subscription is difficult to justify for most organizations.

Slack is the better choice for companies that prioritize developer experience, app integrations, and a more polished messaging UX — and who don't have a strong Microsoft 365 dependency.

The gap between the two platforms on core messaging quality has narrowed significantly since 2020. The decision is now mostly driven by existing technology stack and cost structure, not product quality.

See our full feature comparison at Microsoft Teams vs. Slack.