Microsoft confirms a server-side bug broke Store-based app activation, affecting apps like Notepad with 0x803F8001 error.

The first big Windows update of 2026 has bugs: Outlook freezes, app errors, and how to fix them ...

Windows 11 users are reporting a disruptive wave of application failures, with many unable to open essential system and third-party apps ...

Many Windows 11 users are unable to open apps on their PCs and are running into error code 0x803f8001.