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Office 365 Exchange - Remove AutoMapping of Shared Mail

https://support.microsoft.com/en-au/kb/2646504

The trick here is that the automapping feature is enabled when full rights are given to the shared mailbox.

In powershell, you need to remove the rights, then add it back without the automapping feature (enabled by default)

Add-MailboxPermission -Identity <Mailbox ID1> -User <Mailbox ID2>-AccessRights FullAccess -AutoMapping:$false

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