Microsoft has launched emergency, out-of-band updates on Saturday for Home windows 10, Home windows 11, and Home windows Server to repair a difficulty that prevented Microsoft Outlook from opening when utilizing PSTs saved in cloud storage.
Since Microsoft launched the January 2026 Patch Tuesday updates, Outlook app customers have been encountering freezes when opening the appliance if a PST file is saved in cloud storage, reminiscent of OneDrive and Dropbox.
A Microsoft Outlook PST file is a knowledge file utilized by the appliance to retailer a consumer’s electronic mail and different information domestically on their laptop as an alternative of on the mail server. In enterprise environments, these information are generally used to entry mail when offline and again up essential messages.
“After putting in Home windows updates launched on or after January 13, 2026 (the Originating KBs listed above), some functions would possibly develop into unresponsive or expertise surprising errors when opening information from or saving information to cloud-backed storage, reminiscent of OneDrive or Dropbox,” explains Microsoft.
“For instance, in some configurations of Outlook that retailer PST information on OneDrive, Outlook would possibly develop into unresponsive and fail to reopen until its course of is terminated in Job Supervisor, or the system is restarted.”
“As well as, despatched emails may not seem within the Despatched Objects folder, and beforehand downloaded emails is perhaps downloaded once more. The affected Outlook configurations primarily contain traditional Outlook, which is usually tied to enterprise licensing and isn’t included with most dwelling installations of Home windows. To verify your Outlook configuration, see Characteristic comparability between new Outlook and traditional Outlook.”
Microsoft releases OOB updates
To handle this Outlook downside, Microsoft launched the next out-of-band updates at present:
For these affected by this problem, you possibly can set up the updates by way of Home windows Replace or the Microsoft Obtain Catalog utilizing the hyperlinks above.
Final Saturday, Microsoft additionally launched OOB updates for bugs that prevented entry to Microsoft 365 Cloud PC periods and prevented some PCs with Safe Launch enabled from shutting down or coming into hibernation.
Whereas earlier OOB updates may solely be put in manually by way of the Microsoft Obtain Catalog, Microsoft says these fixes are actually additionally included in at present’s updates.
If these points don’t have an effect on your units, there is no such thing as a want to put in the out-of-band updates.
As a substitute, admins and customers can anticipate the upcoming preview replace or subsequent month’s Patch Tuesday, when the fixes might be rolled out as a part of the common replace schedule.
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