Outlook Mail

[king1]

I'd start with, which flavour of Outlook are we talking about?

The good old Outlook desktop app, part of Office
The new Outlook for Windows, windows mail replacement
The Outlook web app (not likely )


Assuming the new Outlook App, this uninstalled it for me...
https://techcommunity.microsoft.com/t5/o...-p/3941499

Code:

Remove-AppxProvisionedPackage -AllUsers -Online -PackageName (Get-AppxPackage Microsoft.OutlookForWindows).PackageFullName 

and if you want to block it installing again this link suggests a couple of registry keys that trigger the install
https://www.reddit.com/r/Windows11/comme...k_and_dev/

Code:

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Orchestrator\UScheduler\OutlookUpdate]

AND/OR


[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WindowsUpdate\Orchestrator\UScheduler_Oobe\OutlookUpdate]

Usual warnings, backup first etc...

It's the one that takes over my windows mail app.
I usually just uninstall it from programs, but it keeps reinstalling.
So I'm thinking it's the one you are calling "the new outlook for windows, windows mail replacement"

yes that sounds right 

Looks like this on mine, and download is here
https://apps.microsoft.com/detail/9nrx63...n-us&gl=US


so by the sounds of it the way to block it installing again is by deleting the registry keys from the reddit link above, if your comfortable doing so.  I would do the top one first and see if that does the job first (Ignore the DevHome keys I originally posted, they are unrelated.)

But a final word, this feels like the kind of change that MS are always going to keep enabling - so you may block it for a while, but it may get re-enabled at the next feature update, as happens with various other windows settings, because MS in their infinite wisdom think they know better what end users need than the end users...