How to Add Other Mailboxes to Outlook

Greetings, 

With a local Exchange server I can give FULL permission to user A over user B's mailbox. I can then add user B's mailbox to user A's Outlook. User A can view and even send on behalf of user B.

I am trying to so this in Office 365. I have created a test user and have granted myself Full permission to the mailbox through the Office 365 Admin site. I can add the test mailbox to Outlook (it resolves), however it never opens the Inbox.

Additionally, I cannot seem to delete the folder to start over.

How can I add other mailboxes successfully to my instance of Outlook with Office 365?

Thank you!

Charlie O'Hearn

http://www.plexus-it.com