Microsoft releases emergency OOB update to fix Outlook freezes
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Microsoft has released emergency, out-of-band updates on Saturday for Windows
10, Windows 11, and Windows Server to fix an issue that prevented Microsoft
Outlook classic from opening when using PSTs stored in cloud storage. Since
Microsoft released the January 2026 Patch Tuesday updates, Outlook app users
have been encountering freezes when opening the application if a PST file is
stored in cloud storage, such as OneDrive and Dropbox.
A Microsoft Outlook PST file is a data file used by the application to store a
user’s email and other data locally on their computer instead of on the mail
server. In enterprise environments, these files are commonly used to access
mail when offline and back up important messages.
“After installing Windows updates released on or after January 13, 2026 (the
Originating KBs listed above), some applications might become unresponsive or
experience unexpected errors when opening files from or saving files to
cloud-backed storage, such as OneDrive or Dropbox,” explains Microsoft.