Disable auto-mapping of a shared mailbox in Exchange from 2010 Sp2 Print

Disabling Exchange Mailbox Automapping

The Automapping feature in Exchange automatically adds a delegated mailbox in Outlook when a user is granted Full Access permissions to it.

While useful in many scenarios, it can lead to performance issues or confusion when users have access to multiple shared mailboxes.

In such cases, you can disable automapping by using the Exchange Management Shell (EMS) with the following command:

Add-MailboxPermission "MAILBOX-ID" -User "DELEGATED-USER-ID" -AccessRights FullAccess -AutoMapping:$false

Parameters:

• MAILBOX-ID: the name of the main mailbox (granting access)
• DELEGATED-USER-ID: the user receiving access
• -AutoMapping:$false: disables automatic mailbox mapping in Outlook

Note: If you’ve already granted FullAccess without specifying -AutoMapping:$false, you need to first remove the existing permissions and reassign them with automapping disabled.

Example:

# Remove existing permissions
Remove-MailboxPermission -Identity "marketing" -User "paolo.rossi" -AccessRights FullAccess

# Reassign permissions WITHOUT automapping
Add-MailboxPermission "marketing" -User "paolo.rossi" -AccessRights FullAccess -AutoMapping:$false

After executing this, Outlook will no longer automatically add the "marketing" mailbox to the "paolo.rossi" profile.

This approach is recommended for a cleaner and more efficient Outlook experience, especially in environments with many shared mailboxes.