Manage Full Access Permissions on a mailbox

Granting a user Full Access permissions on a mailbox is quite easy using the EMC and only takes a few steps…

1. Open Exchange Management Console

2. Expand Recipient Configuration, select Mailbox and locate the mailbox in the right-hand pane

3. Right-click on the mailbox and choose Manage Full Access Permission…

4. Click Add, select the user(s) and click Add

5. Click Manage

Note: You can also add send-as rights using the Add-ADPermission Exchange Management Shell command.  The example below grants the user john.smith full access rights to the Sales mailbox:

Add-MailboxPermission -Identity "Sales" -User "John.Smith" -AccessRights FullAccess

If you are using linked mailboxes this command is the only way to set permissions for users in another domain.

There is a Microsoft TechNet article here that explains the syntax and parameters in full detail.