Starting from Adaxes 2013.1, Adaxes allows you to grant the Full Access permission for a mailbox using the built-in functionality.
In the Administration Console:
In the Web Interface.
Also, you can grant rights other than Full Access, for example, Send As or Send on Behalf Of.
With Adaxes Business Rules. Custom Commands and Scheduled Tasks, you can grant rights for a mailbox automatically, using the Modify Exchange Properties action. For more details, see Example 10 in the Automate Exchange Mailbox Configuration Tutorial.