Auto-Mapping a mailbox to a profile because I have delegated full access.

In this case they were shared mailboxes and appeared in the left pane of Outlook.

Although this case was for shared mailboxes, the cause and solution apply equally to user mailboxes.

This can occur for on-premises Exchange Server and cloud-hosted mailboxes in Exchange Online.

When auto-mapping is enabled, Outlook receives extra information in the Autodiscover response that tells it to open the additional mailbox.

If you want to remove auto-mapping for a users access to a shared mailbox, then you must remove their mailbox permissions and then re-add the permissions again.

First, for an on-premises mailbox open the Exchange Management Shell, or for a cloud mailbox connect to Exchange Online.

Use Get-MailboxPermission to check that the permissions have been granted as mailbox permissions.

PS C:Get-MailboxPermission -Identity SharedOnPremMailbox -User Adam.Wally fl.

Wally fl RunspaceId: 1af8b9f0 - d64e - 4cb8 - b8e1 - e905c6923ed5 AccessRights: FullAccess Deny: False InheritanceType: All User: ESPNET adam.

PS C:Remove-MailboxPermission -Identity SharedOnPremMailbox -User Adam.Wally -AccessRights FullAccess.

Removing mailbox permission SharedOnPremMailbox for user Adam.Wally with access rights FullAccess.

Wally - AccessRights FullAccess Confirm Are you sure you want to perform this action Removing mailbox permission SharedOnPremMailbox for user Adam.Wally with access rights FullAccess.

Y Yes A Yes to All N No L No to All Help ( default is Y ): y.

PS C:Add-MailboxPermission -Identity SharedOnPremMailbox -User Adam.Wally -AccessRights FullAccess -AutoMapping:false.

When Outlook receives the updated Autodiscover response, it will remove the auto-mapped mailbox from the users Outlook profile.

If the user needs to access the mailbox for anything, they must add it to their profile, or open it via the Outlook File menu.

The property that stores this information is named msExchDelegateListLink, and it can be queried using Get-ADUser.

For example, to view the list of auto-mapped users for a mailbox named Payroll, we can run the following command.

PS C:Get-ADUser -Filter Name -eq payroll -Properties msExchDelegateListLink Select -ExpandProperty msExchDelegateListLink.

Thillainayagam, OU Users, OU Head Office, OU Company, DC exchangeserverpro, DC net CN Alex.

Heyne, OU Users, OU Branch Office, OU Company, DC exchangeserverpro, DC net.

He works as a consultant, writer, and trainer specializing in Office 365 and Exchange Server.

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