Stick with Teams — it's bundled in and deeply integrated with Office apps, SharePoint, and OneDrive.
→ Microsoft TeamsSlack's threading, channels, and integration ecosystem remain unmatched for pure chat productivity.
→ SlackZoom's reliability, external guest experience, and AI Companion features lead the video space.
→ Zoom WorkplaceChat + Meet + Drive + Docs work seamlessly together. No extra software to install.
→ Google WorkspaceFull data sovereignty, E2E encryption, and air-gapped deployment for regulated industries.
→ MattermostUnlimited message history, 1:1 calls, screen sharing — all free. Best zero-cost option in 2026.
→ Pumble