Microsoft Whiteboard is migrating from legacy Azure-based storage to OneDrive-backed storage. Migration must be completed by September 25, 2026; afterward, legacy Whiteboards become read-only until October 16, 2026, when they will be permanently deleted. Admins should inventory, notify users, and ensure migration before deadlines.
Applies to: Microsoft OneDrive · Microsoft Teams · Microsoft 365 apps
Source: mc.merill.net — data via Merill Fernando's open archive (MIT).