Mailboxes to which your account has full access aren't automapped to Outlook profile

• Applies to:

  Outlook for Microsoft 365, Outlook 2019, Outlook 2016, Outlook 2013

Original KB number:   3190323

Symptoms

When you assign full mailbox access to a specific set of mailboxes through a security group, the members of the assigned group don't see the mailbox get automapped to their Outlook profile. However, the mailbox can be accessed if the mailbox is manually added to the Outlook profile or by using Outlook on the Web.

Cause

The autodiscover process examines the msExchDelegateListBL mailbox attribute to determine which mailboxes should be automapped to the Outlook profile. Currently, the securitygroup group membership list isn't expanded during the autodiscover process. This, in turn, prevents the mailboxes from being automapped to the user's Outlook profile.

Resolution

For automapping to work correctly, users must explicitly add full mailbox access to each mailbox that they want to have automapped to their Outlook profile.