cloud storage io

About this tag
The tag cloud storage io covers a specific Windows file I/O regression where Microsoft's January 2025 security update broke Outlook and other programs' ability to open or save files in cloud-backed folders like OneDrive and Dropbox. Microsoft issued an emergency out-of-band update (KB5078127 for Windows 11 24H2/25H2, with parallel KBs for other versions) to fix the cloud storage I/O issue. The fix is cumulative and includes earlier security updates. Affected users are urged to install via Windows Update or the Microsoft Update Catalog. This tag is relevant for Windows administrators and users experiencing file access problems with cloud storage services after applying recent updates.

  1. Microsoft Fixes Outlook Cloud File I/O with Emergency KB5078127 Update

    Microsoft pushed an emergency out‑of‑band update late last week to repair a regression introduced by its January security rollup that left Outlook and other programs unable to open or save files stored in cloud‑backed folders such as OneDrive and Dropbox. The fix — delivered as KB5078127 for...
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    • cloud file i o cloud storage cloud storage io cloud sync cloud synced files emergency patch onedrive sync outlook outlook hangs outlook issues outlook pst outlook pst issues patch tuesday pst management windows 11 windows 11 patch windows 11 updates windows update
    • Replies: 4
    • Forum: Windows News