Microsoft confirms a server-side bug broke Store-based app activation, affecting apps like Notepad with 0x803F8001 error.
Windows 11 KB5078127 is an 'out-of-band' patch to fix an issue that broke Outlook Classic (POP, PST) after January 2026 Patch ...
Windows 11 users report Notepad, Snipping Tool, and other apps failing to open, showing Microsoft Store error 0x803F8001 on affected systems.
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