windows 11 boot issues

  1. Windows 11 UNMOUNTABLE_BOOT_VOLUME: December rollback and January KB5074109 boot failures

    Microsoft has confirmed that a chain of updates — a failed December 2025 security update that left some machines in an “improper state,” followed by the January 13, 2026 cumulative update (KB5074109) — is responsible for a limited but serious set of Windows 11 boot failures that present as...
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    • Forum: Windows News

  2. Windows 11 KB5074109 Boot Failures and WinRE Recovery Guide

    Microsoft released its January cumulative for Windows 11 (KB5074109) on January 13, 2026 — and within days a series of serious regressions began surfacing, from brief black screens on some Nvidia-equipped machines to full startup failures that print UNMOUNTABLE_BOOT_VOLUME (Stop Code 0xED) and...
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    • Replies: 14
    • Forum: Windows News

  3. Patch Tuesday KB5074109 Breaks Classic Outlook and Encrypt Only Emails

    A routine Patch Tuesday release on January 13, 2026 has left a significant portion of classic Outlook users scrambling: the Windows 11 cumulative update KB5074109 and a separate Outlook Current Channel build have each introduced regressions that render parts of the traditional Outlook experience...
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    • Replies: 9
    • Forum: Windows News

  4. KB5074109 Outlook Hang After January 2026 Patch Tuesday

    A routine January Patch Tuesday rollup (KB5074109) accidentally left parts of Microsoft’s classic Outlook experience unstable for a measurable number of users, triggering freezes, lingering OUTLOOK.EXE processes, lost Sent Items and a rapid sequence of follow‑up fixes and mitigations from...
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    • Replies: 12
    • Forum: Windows News