Slack (Salesforce) vs Microsoft Teams: Which to Pick in 2026

For Microsoft 365 customers, Teams is usually cheaper incrementally because chat is bundled into suites you may already pay for (Microsoft 365 Business Basic ~$7/user/mo, Business Standard ~$14/user/mo billed annually, as of July 2026 per Microsoft — both rose on Jul 1, 2026 from $6 and $12.50, with existing customers keeping prior pricing until renewal), and standalone Teams Essentials is ~$4/user/mo. Slack is priced as a standalone product: Pro ~$7.25/user/mo and Business+ ~$12.50/user/mo billed annually (as of 2026, per Slack's pricing). If you don't need the Office suite, standalone costs are close; if you already run Microsoft 365, Teams' incremental cost is usually lower. Model your real seat count and whether you need Office apps.

Often yes for cost and governance: you avoid a separate per-seat bill, and identity, compliance, and file storage are unified inside Microsoft 365. But keep Slack when messaging UX, the larger third-party app ecosystem, or heavy cross-company collaboration via Slack Connect matter to how your teams actually work. Some organizations run both — Teams for internal Microsoft-anchored work and Slack for external/partner channels. Migration effort scales with message history, integrations, and custom workflows.

Yes, but not natively. Slack connects to Outlook, OneDrive, SharePoint, and Microsoft's calendar/email tools through apps, and can even place Microsoft Teams calls — it's just not as deep as Teams' built-in experience, which co-edits Office files inside the app. Slack's deepest native integration is with Salesforce (its parent) and its ~2,600+ App Directory (as of 2026). Teams' edge is native Microsoft 365 depth; Slack's edge is breadth of third-party apps.

They cover different scopes. Slack AI (channel/thread recaps and AI search over your messages) was folded into Slack's paid plans in 2026 per multiple pricing guides — verify current packaging, since it was previously a ~$10/user/mo add-on. Microsoft 365 Copilot reaches across Teams, Word, Excel, Outlook, and more, but is a separate add-on at ~$30/user/mo billed annually on top of a qualifying license (as of 2026, per Microsoft). In short: Slack AI is cheaper and message-centric; Copilot is broader across the Office suite and pricier.