How to remove old Outlook after switching to New Outlook

Thanks Nathan, that is helpful and at the same time explains at the same time why it is behaving so differently then parallel installations. I have solved my issue of some features being linked to the old mode of outlook (like sending files from explorer, opening vcs files) and some to the new outlook (like opening mail links) by creating a new windows profile where everything is still linked to the old outlook mode.

I won't use the new outlook mode as it does not support opening of vcs files and pst files, which I need to access archived mailboxes. I still really don't understand how Microsoft removed these features. I understand that you maybe don't want to create pst files anymore, but opening existing pst files should be possible. And vcs files are a standards way of sharing contact information and it is beyond me why this feature has been dropped.

I hope that the old outlook mode will be available as long as these essential features are not in the new version.

if you use intune to remove out classic you can update your XML to

<ExcludeAPP ID="Outlook" />

this will remove outlook classic from the devices being managed as they next check in

Also suggest reading

Policy for Admin-Controlled Migration to new Outlook for Windows - Microsoft 365 Apps | Microsoft Learn

• You want to force all your users to new Outlook and not give them an option to return to classic Outlook.
  • Enable the DoNewOutlookAutoMigration policy by setting it to 1.
  • Set the NewOutlookAutoMigrationRetryIntervals policy to 1.
  • Enable the HideClassicOutlookToggleOutlook mailbox policy by setting it to true.

Hello Everyone

It appears that Microsoft hasn't impletemented MAPI support in the new Outlook, so any apps that try to use it will try to open Outlook 2016 instead. It is possible to run both versions of Outlook on the same PC, so the workaround is to use Outlook 2016 for anything that needs the MAPI interface.

See these links for more info:

Fixes or workarounds for recent issues in new Outlook for Windows - Microsoft Support

New Outlook users unexpectedly see the “Welcome to Outlook 2016" setup wizard - Microsoft Support

I hope this helps someone!

The problem is I cannot even use or sign into my old outlook if I want to - It asks me for the password of my old job email which was disabled after I left the job and it does not allow me to sign in with any other account - I would love to keep using it but I can't - that's why I want to remove it because it keeps opening everything

Yup, exactly the same setup (Windows 11, Office 365, New and Old Outlook) and there neither "Repair", no "Change".

Just can't get rid of this thing!