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Microsoft has issued its second emergency patch of the month.
The brand new patch fixes a bug that impacts cloud-based providers.
However one other bug is stopping some Home windows PCs from booting up.
This 12 months has bought off to a tough begin for Microsoft and Home windows customers, a minimum of in the case of bugs. The January 2026 replace launched a slew of glitches that the corporate is now attempting to wash up. On the identical time, new bugs maintain popping up and plaguing customers.
New emergency patch
On Saturday, Microsoft kicked off its second out-of-band emergency patch of the month. Dubbed KB5078127, this one fixes an issue launched by the January Patch Tuesday replace. Particularly, the replace prevented Outlook and different apps from opening recordsdata from, or saving recordsdata to, cloud-based storage websites akin to OneDrive and Dropbox. This meant that Outlook would fail to open for many individuals who saved their PST recordsdata on OneDrive.
This emergency patch contains the primary out-of-band patch issued on Jan. 17 to repair points with distant connections to Home windows Cloud units and with Safe Launch. It additionally carries the safety fixes and enhancements from the Jan. 13 replace, however hopefully with out the bugs.
In case you are working into bother attempting to open or save recordsdata with OneDrive, Dropbox, or different cloud websites, chances are you’ll need to set up this newest patch and maintain your fingers crossed that it would not introduce any new bugs. Head to Settings and Home windows Replace, and you must discover the KB5078127 replace ready for you. I noticed it on my Home windows 11 PC at this time. In any other case, click on the button to verify for updates, and it’ll pop up. Permit the replace to put in, after which you will must reboot your PC.
The bugfest is much from over
Whereas Microsoft has been fixing bugs brought on by the Patch Tuesday replace, one other glitch has surfaced.
Also brought on by the January replace, this one is stopping a restricted variety of Home windows computer systems from booting up, as noticed by AskWoody. Impacting Home windows 11 25H2 and 24H2, the bug triggers a black display screen upon boot-up and shows a cease code pointing to an unmountable boot quantity.
In case you’re affected, you are unable to launch Home windows and should have to make use of Home windows Restoration to revive your surroundings. Microsoft stated that it’s investigating the issue however clearly has no repair at this level.
“Microsoft has obtained a restricted variety of experiences of a difficulty by which units are failing besides with cease code ‘UNMOUNTABLE_BOOT_VOLUME’ after putting in the January 2026 Home windows safety replace launched January 13, 2026, and later updates,” the corporate stated in a help be aware. “Affected units present a black display screen with the message ‘Your system bumped into an issue and desires a restart. You possibly can restart.’ At this stage, the system can’t full startup and requires handbook restoration steps.”
High quality management query
A few of these bugs are remoted to particular {hardware} and software program configurations. And with all of the variations on the market, it is tough for Microsoft to check for each doable mixture. The corporate has additionally responded comparatively shortly to squash these new bugs. However that does not depart it off the hook, not by an extended shot.
Pushing out an replace that fixes some bugs solely to create new ones begs the query of what kind of high quality management is in place at Microsoft and the way it expects folks to belief it. With just one supported shopper model of Home windows, the onus has been on the corporate to verify the OS is as secure and dependable as doable. Clearly, that is not taking place, not when common Home windows updates which are supposed to repair issues find yourself inflicting new ones.
