Outlook doesn't display its windows correctly in coherence mode

Discussion in 'Windows Virtual Machine' started by johnrellis, Oct 20, 2025.

  1. johnrellis

    johnrellis Member

    Messages:
    25
    Since I updated from Parallels version 25 to 26.1.1, Microsoft Outlook running in coherence mode doesn't display its windows properly. When reply windows open, they either don't appear at all or they appear truncated in the window frame of the main Outlook window. The drop-down menus from the top menu bar of the message windows gets truncated at the window's boundary rather than extending out past it. (Screen shots attached.)

    How do I roll back? This is fairly disruptive. (I usually wait for the .1 release before updating to a new major version, but next ext year, I'll wait for the .2 release.)

    Mac OS 15.7.1 / Mac OS M2 Max (Apple Silicon)
    Parallels Desktop for Mac Pro 26.1.1
    Parallels ARM Virtual Machine
    Windows 11 Pro, Version 24H2, OS build 26100.6899, Windows Feature Experience Pack 1000.26100.253.0
    Microsoft Outlook for Microsoft 365 MSO (Version 2510 Build 16.0.19328.20082) 64-bit

    Updating to Mac OS 26 isn't an option yet, since Adobe Lightroom Classic 14 isn't certified to run on it and I'll want to wait at least a month after Lightroom Classic 15 arrives next week before upgrading Mac OS 26.

    Screenshot 2025-10-20 at 3.08.46 PM.jpeg

    Screenshot 2025-10-20 at 3.17.43 PM.jpeg

    Screenshot 2025-10-20 at 3.17.12 PM.jpeg
     
  2. ImraanN

    ImraanN Staff Member

    Messages:
    5
    Best Answer
    Hello @johnrellis and @JonathanP24 ,

    We've identified this as a known issue introduced by the latest Windows 11 update. Our development team is already working on a fix.

    As a temporary workaround, please uninstall the Microsoft Windows (KB5066835) Security Update. After uninstalling, we recommend pausing Windows updates for 1-5 weeks to prevent this update from reinstalling until a permanent fix is released.

    To stay informed about official fixes, we encourage you to subscribe to our release notes.
    Click Get updates on that page to receive notifications when new versions, including potential fixes, are released.

    Thank you.
     
    johnrellis likes this.
  3. johnrellis

    johnrellis Member

    Messages:
    25
    Oops, the Windows version is actually:

    Windows 11 Pro, Version 25H2, 26200.6901, Windows Feature Experience Pack 1000.26100.253.0

    (I looked at the wrong VM.)
     
  4. JonathanP24

    JonathanP24 Bit poster

    Messages:
    2
    Several of the users on my team are experiencing the same issue. Has anyone made any progress on a solution?
     
    johnrellis likes this.
  5. ImraanN

    ImraanN Staff Member

    Messages:
    5
    Best Answer
    Hello @johnrellis and @JonathanP24 ,

    We've identified this as a known issue introduced by the latest Windows 11 update. Our development team is already working on a fix.

    As a temporary workaround, please uninstall the Microsoft Windows (KB5066835) Security Update. After uninstalling, we recommend pausing Windows updates for 1-5 weeks to prevent this update from reinstalling until a permanent fix is released.

    To stay informed about official fixes, we encourage you to subscribe to our release notes.
    Click Get updates on that page to receive notifications when new versions, including potential fixes, are released.

    Thank you.
     
    johnrellis likes this.

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