Microsoft releases emergency OOB update to fix Outlook freezes www.bleepingcomputer.com/news/micr…

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.