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 traditional 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, corresponding to OneDrive and Dropbox.
A Microsoft Outlook PST file is a knowledge file utilized by the appliance to retailer a consumer’s e-mail and different information regionally on their pc as a substitute of on the mail server. In enterprise environments, these information are generally used to entry mail when offline and again up necessary messages.
“After putting in Home windows updates launched on or after January 13, 2026 (the Originating KBs listed above), some purposes may change into unresponsive or expertise sudden errors when opening information from or saving information to cloud-backed storage, corresponding to OneDrive or Dropbox,” explains Microsoft.
“For instance, in some configurations of Outlook that retailer PST information on OneDrive, Outlook may change 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 Gadgets folder, and beforehand downloaded emails could be downloaded once more. The affected Outlook configurations primarily contain traditional Outlook, which is often tied to enterprise licensing and isn’t included with most house installations of Home windows. To test your Outlook configuration, see Characteristic comparability between new Outlook and traditional Outlook.”
Microsoft releases OOB updates
To deal with this Outlook downside, Microsoft launched the next out-of-band updates at the moment:
For these affected by this subject, you’ll be able to set up the updates through 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 classes 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 through the Microsoft Obtain Catalog, Microsoft says these fixes at the moment are additionally included in at the moment’s updates.
If these points don’t have an effect on your units, there isn’t a want to put in the out-of-band updates.
As a substitute, admins and customers can look ahead to the upcoming preview replace or subsequent month’s Patch Tuesday, when the fixes will probably be rolled out as a part of the common replace schedule.
It is price range season! Over 300 CISOs and safety leaders have shared how they’re planning, spending, and prioritizing for the yr forward. This report compiles their insights, permitting readers to benchmark methods, establish rising traits, and evaluate their priorities as they head into 2026.
Find out how prime leaders are turning funding into measurable influence.
