User Mailboxes and Shared Mailboxes

User Mailboxes and Shared Mailboxes

Exchange Server supports user mailboxes and shared mailboxes. User mailboxes are used by people who log in to their mailbox to send and receive e-mail. Shared mailboxes do not have an active user account, but represent a department, group, or service like OpenEFT or BillFiler. Shared mailboxes have a disabled Active Directory account and do not need an Exchange client access license or an Exchange Online license.

Users must be granted permissions to interact with a shared mailbox. Permissions are granted to allow users to:

• Access a shared mailbox and work with the items in the shared mailbox.
• Impersonate the shared mailbox and send email as that mailbox.
• Send email on behalf of a shared mailbox.

Access normally works without a problem in a most Exchange environments, but things can be different and not work as you expect. 

Granting Send As Permission

The Send As permission is not a mailbox permission. Instead, it is an Active Directory permission.