Microsoft has issued an emergency replace for Home windows 11 after a newly reported bug started inflicting critical stability issues for some customers. The problem was described as vital as a result of it may crash Microsoft Outlook underneath particular circumstances, notably when customers saved PST recordsdata inside folders synchronized by way of cloud providers. This setup is comparatively widespread in company environments, the place Outlook information recordsdata are sometimes saved in shared or backed-up places.
The issue appeared shortly after the January 2026 safety replace was launched. Stories indicated that the bug affected purposes trying to open or save recordsdata in places tied to OneDrive integration. Relying on the state of affairs, affected applications may freeze and cease responding or show surprising error messages, disrupting regular work routines and productiveness.
The brand new challenge is said to Microsoft Outlook (Picture: Microsoft).
That is the second time in early 2026 that Microsoft has delivered an “out-of-band” replace—which means a repair launched exterior the usual month-to-month patch schedule. Earlier within the yr, one other emergency package deal was distributed following complaints from customers experiencing failures when shutting down the system, getting into hibernation mode, or finishing logins by way of distant connections. These earlier points impacted each Home windows 10 and Home windows 11, elevating issues about system reliability after routine updates.
Out-of-band releases are usually reserved for issues Microsoft considers too extreme to postpone till the following scheduled Patch Tuesday replace. They’re typically deployed when a bug impacts numerous customers, causes crashes, or interferes with important providers and enterprise operations.
On this case, Microsoft’s emergency replace is cumulative, which means it contains not solely the repair for the newly found Outlook-related bug but additionally patches for different latest issues. Customers solely want to put in the most recent package deal to obtain all included corrections, together with points launched by the January safety replace.
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