An out-of-band (OOB) cumulative replace, KB5078127, to handle crucial file system compatibility points affecting Home windows 11 customers.
The replace resolves widespread issues launched by the January 13, 2026, safety replace (KB5074109) that prompted utility freezes and cloud storage failures throughout a number of platforms.
Essentially the most vital repair addresses file system corruption affecting cloud-based storage functions.
Customers reported extreme points when making an attempt to open or save recordsdata to OneDrive, Dropbox, and different cloud companies.
In significantly problematic eventualities, Outlook configurations that retailer private storage desk (PST) recordsdata on OneDrive skilled full utility hangs, forcing customers to terminate processes or restart their methods to regain performance manually.
Extra points included lacking despatched objects and beforehand downloaded emails being unnecessarily re-downloaded, creating vital productiveness disruptions for enterprise customers managing giant mailboxes.
Replace Classification and Supply
KB5078127 is assessed as a cumulative OOB replace that comes with all safety and high quality enhancements from the January 13 safety replace (KB5074109).
The January 17 OOB replace (KB5077744), plus these further crucial file system fixes. This strategy ensures customers obtain complete safety by means of a single set up.
The replace features a mixed servicing stack replace (SSU KB5071142, model 26100.7295) that improves Home windows Replace set up reliability.
Microsoft now bundles SSU packages with cumulative updates to streamline patching.
The replace is out there by means of Home windows Replace and the Microsoft Replace Catalog. Gadgets with automated updates enabled will obtain KB5078127 routinely.
For handbook set up, customers navigate to Settings > Home windows Replace and choose Obtain & set up.
IT directors can speed up deployment with Microsoft Intune utilizing the “Expedite Home windows high quality updates” performance, or with Home windows Autopatch for a fast organizational rollout.
KB5078127 updates 4 AI elements to model 1.2511.1224.0: Picture Search, Content material Extraction, Semantic Evaluation, and Settings Mannequin. These enhancements improve Home windows 11’s built-in AI capabilities.
Microsoft recognized one minor problem: the password icon might seem lacking or invisible on the lock display screen sign-in choices. This doesn’t have an effect on authentication performance.
The mixed SSU and LCU package deal can’t be partially eliminated. Whereas directors can take away the LCU utilizing DISM instructions, the SSU element stays completely put in.
Customers can’t uninstall both element utilizing the Home windows Replace Standalone Installer.
Organizations ought to prioritize deploying KB5078127 to affected Home windows 11 cases, significantly methods with Outlook configurations storing information in cloud storage environments.
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