Outlook (Classic) windows remain hidden in Coherence Mode

[Johnny Two Thumbs]

Hi Everyone,
All of the sudden, when I open any message in a new window, using Outlook Classic, in Coherence mode, the new window that is supposed pop up remains hidden.

It's there.... If I hit Start+Tab, to show / switch between open windows, it's there (see attached screenshots). But the window only appears if I select the new message window.

This was working perfectly fine until a day or two ago.

So far I have re-installed Parallels Tools, and run disk utility on the Mac side to make sure all permissions were good.

I'm currently running...
Paralles Desktop 26 for Mac, Pro Edition, V 26.1.1 (57288)
MacBook Pro M3 Max, Tahoe 26.0.1


For reference, the 1st image is what my desktop looks like after hitting New Email, or opening an existing email in Outlook Classic, in Coherence Mode

The 2nd image, is what I see when I hit Start + Tab to switch between open Window...

Thanks in advance for helping and suggestions.

Cheers,
J2T

 

[滝江成吉]

私は、coherenceモードで、Microsoft Office関連のアプリを開くと、しばらく表示されないか、関連ファイルを2度クリックしないと表示されない現象が発生
あなたと同じ原因かわかりませんが、私の対策は、Microsoft Windows （KB5066835）のセキュリティ更新プログラムをアンインストールすると改善されました。
ただ、また強制的にインストールされると、また同じ不具合が発生するので、parallel側へ改善依頼してます。

 

[Ashley Chumun]

Hi Everyone,
All of the sudden, when I open any message in a new window, using Outlook Classic, in Coherence mode, the new window that is supposed pop up remains hidden.

It's there.... If I hit Start+Tab, to show / switch between open windows, it's there (see attached screenshots). But the window only appears if I select the new message window.

This was working perfectly fine until a day or two ago.

So far I have re-installed Parallels Tools, and run disk utility on the Mac side to make sure all permissions were good.

I'm currently running...
Paralles Desktop 26 for Mac, Pro Edition, V 26.1.1 (57288)
MacBook Pro M3 Max, Tahoe 26.0.1


For reference, the 1st image is what my desktop looks like after hitting New Email, or opening an existing email in Outlook Classic, in Coherence Mode

The 2nd image, is what I see when I hit Start + Tab to switch between open Window...

Thanks in advance for helping and suggestions.

Cheers,
J2TView attachment 23909 View attachment 23910

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!

 

[RonJ1]

Unfortunately - that KB is locked under 24h2 - so if you already upgraded to 25h2, you are stuck and cannot remove that specific KB. Hope parallels can fix this soon.

 

[RonJ1]

I found a temp workaround - right click the outlook icon in the dock, then you can pick the window that is hidden as it will be shown in the list. I found a half dozen reply-to emails that disappeared from the screen but were there - hidden.