OneDrive Sync Client Has Meltdown During Azure AD Outage

The OneDrive sync client is an important Microsoft 365 component which underpins features like autosave and coauthoring of Office documents. During the March 15 Azure AD outage, the client had a meltdown and removed all the local copies of files stored in a SharePoint Online folder, seemingly because it couldn’t authenticate. The problem was easily fixed, but it’s a bad example of handling what could be a transient authentication issue.

OneDrive Clients and Version History

OneDrive clients have access to version history for files stored in SharePoint Online and OneDrive (business and consumer). Until they don’t, which is why I am grumpy today. As it turns out, the feature works on one PC but not another, and that’s super-frustrating.