I should be able to work this one out myself but I am at a loss.
I have a service account that has been given Full Mailbox access to about 200 mailboxes throughout my organisation for my contact management software.
The account is able to log in to all of the mailboxes except 1. I have triple checked that the service account has full mailbox rights on the account in question but I am unable to login to that account using the service account credentials. I keep on getting prompted for a password.
The Interesting thing is, I also have a blackberry account that can login to the account no problems. The user has no problems accessing his mailbox. It just seems to be this one service account.
I have tried removing and readding the permissions but no change.
The account has been delegated the rights for over a week now.
There are no errors in my exchange server.