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What version of Exchange?

Excahnge 365

In your CA policy, target the desktop apps with

Conditions / Client Apps / Mobile apps and desktop clients

. You’’ll probably want to target the policy to Windows, macOS, Linux etc. only, because this will block Outlook on iOS and Android.

Ah, the mobile apps part of that was throwing me off. Didnt know you could exlude that by stating Win\Mac\Linux ect. Perfect, thanks