Exchange Management Console

The Exchange Management Console is the admin program for Exchange 2010.

To Grant Full Control to a user's mailbox

This will allow another user to 'Send As' the first user.

1. Open the Exchange Management Console
2. Expand "Recipient Configuration"
3. Right mouse click on "Mailbox" and choose find from the list.
4. Find the user you would like to grant permissions for (ie: the mailbox of the user who will have the messages sent at).
5. Right mouse click on the user and choose "Manage Full Access Permissions"
6. Add the user who will be able to send as the first user to this list.