The web-based "Share to Teams" feature in Outlook will retire between September 22 and October 3, 2025. Users without the Teams desktop app will be prompted to install it, while those with the app continue sharing via Teams. No admin action is required, but user notification is recommended.
Applies to: Microsoft Teams · Microsoft 365 for the web · Microsoft 365 apps
Source: mc.merill.net — data via Merill Fernando's open archive (MIT).