Offline support in the new Outlook for Windows will allow users to create, edit, and delete single calendar events without internet. Rollout starts late September 2025, completing by February 2026. Recurring events offline are not supported. Controlled by the Owamailboxpolicy -OfflineEnabledWin setting.
Applies to: Exchange Online
Source: mc.merill.net — data via Merill Fernando's open archive (MIT).