OneView and TrueTime features in Outlook Web App will retire between March and June 2026, removing personal account connections and combined calendar views. Users must manually manage calendars afterward. No admin action is needed, but users should be informed and directed to Outlook desktop apps for multi-account support.
Applies to: Exchange Online · Microsoft 365 for the web
Source: mc.merill.net — data via Merill Fernando's open archive (MIT).