Add Full Access Mailboxes with Outlook Auto-Mapping Disabled


In Exchange 2010 Service Pack 1 (SP1) Exchange introduced a feature that allows Outlook 2007 and Outlook 2010 clients to automatically map to any mailbox to which a user has Full Access permissions. If a user is granted Full Access permissions to another user’s mailbox or to a shared mailbox, Outlook automatically loads all mailboxes to which the user has full access.

Use these commands to load the Exchange Online cmdlets:
$UserCredential = Get-Credential
$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri -Credential $UserCredential -Authentication Basic -AllowRedirection
Import-PSSession $session
This example grants the user Andy full access permission to Thirza’s mailbox and disables the auto-mapping feature.
Add-MailboxPermission -Identity thirza@saputra.local -User andy@saputra.local -AccessRight FullAccess -InheritanceType All -Automapping $false
Another example, to add full access permission for Leah to Dave’s mailbox, type the following command:
Add-MailboxPermission -Identity dave@saputra.local -user leah@saputra.local -accessrights Fullaccess -AutoMapping:$false
Refer to this link for more information.