Microsoft Outlook new windows invisible in Coherence Mode

Discussion in 'Parallels Desktop on a Mac with Apple silicon' started by Johnny Two Thumbs, Oct 22, 2025.

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  1. Johnny Two Thumbs

    Johnny Two Thumbs Johnny Two Thumbs Bit poster

    Messages:
    2
    Hello all,
    For reasons unknown to me, all of the sudden, when using coherence mode and Microsoft Outlook (classic, not new), when I select a message to open in a new window, it is invisible.

    It's there, just hidden.... If I hit the Start & Tab button to open up windows app switching screen, the new message window is there, and shows up once it is selected, but not until I do this extra step.

    I have already reinstalling parallel tools with no luck or fix. Ran disk utility first aid on the Mac side to make sure permissions were all good.

    Currently using:
    Parallels Desktop 26 for Mac, Pro Edition
    Version 26.1.1 (57288)

    MacBook Pro, M3 Max
    Tahoe 26.0.1

    All software is up to date and working normally except for this new issue.
    Thanks in advance for the assist here.

    2 pics uploaded to show you all my screen with the open outlook message, which is hidden, and what it looks like after hitting Start+Tab in windows to switch between open windows Message Window Open, but hidden.jpeg Hidden Window shown, when hitting Start & Tab to swtich apps in Windows.jpeg
     
    Johnny Two Thumbs, Oct 22, 2025
    #1
  2. Ashley Chumun

    Ashley Chumun Staff Member

    Messages:
    217
    Greetings,
    Thank you for your feedback.
    We'd like to inform you that this is a known issue, and our Development team is actively working on a permanent fix.
    In the meantime, the recommended workaround is to uninstall the Microsoft Windows Security Update KB5066835 from the affected virtual machine. This has been confirmed to resolve the issue for many users while we finalize a long-term solution.
    Thank you!
     
    Ashley Chumun, Oct 29, 2025
    #2

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