Linked mailboxes are useful for large organizational changes that occur during mergers, acquisitions, and company splits, when mailbox migration is common. This feature enables linking mailboxes from different Exchange forests to negate disruption of user email. The mailboxes must be in DRA managed domains with the Exchange Policy enabled, and you must have powers delegated to you to manage linked mailboxes. When you create a linked mailbox, a Linked Mailbox tab is added to the properties of the user object.
Linked mailbox management is only supported in the Web Console. You create a linked mailbox from the toolbar of a selected user account. This option is only enabled when the selected user’s domain has an external forest trust with other managed domains in DRA. Only disabled user accounts will be listed when searching for an account to link to in another DRA managed domain.
You can create a linked mailbox from two user accounts selected in different managed Exchange forests.
You can delete a linked mailbox from the toolbar of a selected user that has a linked mailbox.
You can modify the properties of a linked mailbox from the Linked Mailbox tab in a selected user’s properties.
You can create a linked archive mailbox from a selected user that has a linked mailbox.
You can delete a linked archive mailbox from the toolbar of a selected user that has a linked archive mailbox.
You can restore a linked mailbox that was deleted if the Recycle Bin from that domain is enabled.