Kindly go through the following Microsoft reference:
Cannot configure the default email client using Group Policy
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How does a domain administrator assign a Default Mail Application to windows 10 users without replacing the entire AppAssociations.xml?
I want to only set the default mail app to Outlook instead of Windows Mail. I do not want to replace the entire AppAssociations.xml due to the truth that existing users have different file associations and one size xml does not fit all users.
Kindly go through the following Microsoft reference:
Cannot configure the default email client using Group Policy