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Microsoft's January 2026 Windows update causes Outlook and other applications to freeze when saving files to cloud storage services like OneDrive or Dropbox. The issue particularly affects Outlook users with PST files stored on OneDrive, requiring process termination or system restart to recover. Microsoft recommends moving PST files out of OneDrive as a workaround and is working on a fix. This adds to multiple problems from the January update, including authentication failures and shutdown issues.

Outlook might freeze when saving files to OneDrive