Source: Microsoft 365 Message Center MC1253753, published 16 March 2026. Change takes effect late September 2026. View announcement archive
Starting in late September 2026, whiteboard files created from Microsoft Teams channel tabs will be stored in the associated SharePoint site rather than in the creator's OneDrive for Business account. Microsoft flagged this as a major change in Message Center notification MC1253753.
What is changing
When a Teams user opens the Whiteboard app from a channel tab and creates a new board, that file currently lands in the creator's OneDrive. After the rollout in late September 2026, new whiteboards created from channel tabs will go directly into the document library of the SharePoint site associated with that channel.
Only new whiteboards are affected. Boards already saved to OneDrive stay where they are. Microsoft is not migrating existing boards automatically. Channel members will continue to access pre-existing boards through the Teams channel tab, but access to those legacy boards continues to follow the creator's OneDrive sharing rules rather than channel membership.
Why Microsoft is making this change
The original design had a predictable failure mode. When a whiteboard lives in the creator's OneDrive, channel members can only reach it if the sharing settings, Information Barriers, or Conditional Access policies allow it. If the creator leaves the organisation and their account is deprovisioned, the whiteboard may become inaccessible to everyone else in the channel.
Storing the file in the channel's SharePoint site resolves this cleanly. Channel membership becomes the access control boundary, which is exactly the same model used for files uploaded through the Files tab in Teams. The change brings Whiteboard into alignment with every other Teams file type.
How does this affect SharePoint storage quotas?
Whiteboard files are not large individually, but teams that run frequent workshops, retrospectives, or planning sessions accumulate many boards. Under the new model, each whiteboard counts against the SharePoint site collection's storage quota instead of the creator's OneDrive allocation.
Sites that are close to their ceiling before September 2026 may need cleanup or a quota increase before the change rolls out. For active sites where version history is the main driver of storage growth, Space Master's Version Trimmer is often the fastest way to reclaim significant quota without touching live content.
Compliance and governance impact
For SharePoint admins in regulated industries, this is the most consequential part of the change. Whiteboards stored in SharePoint inherit all the Microsoft Purview controls applied to that site:
- DLP policies scoped to the SharePoint site will now cover whiteboard files.
- Sensitivity labels assigned at the site or library level will be applicable.
- Retention and deletion policies for the SharePoint site will govern board content.
- Audit logging and eDiscovery will capture whiteboard activity through standard SharePoint audit trails.
Whiteboards used in legal, HR, or financial review sessions were effectively outside SharePoint's compliance perimeter when they lived in OneDrive. From late September 2026, they will fall within it. If your organisation has DLP or retention policies that were deliberately scoped to exclude whiteboard content, review those scopes and confirm the intent still holds under the new storage model.
What admins should do before September 2026
Microsoft confirmed this change rolls out automatically - no administrator action required to enable it. Three tasks are worth completing before September regardless:
- Check storage headroom on high-use Teams channel sites. Sites near their quota may trip limits within days of new whiteboards starting to accumulate.
- Review DLP and retention policy scope. Confirm that whiteboard files landing in SharePoint channel document libraries will be covered as intended. Policies already scoped to "SharePoint and OneDrive" typically need no change.
- Update helpdesk documentation. Support staff and end users who know "whiteboards live in OneDrive" will need that model corrected. Access to pre-existing boards will not change, but questions about where new boards are saved will arrive after the rollout.