Thought I'd update this since I had the problem with customer today.
A users mailbox was 'locked out'.
I tried to duplicate this on our system and I couldn't make it happen.
I looked on MOL to try and find the admin guide for the embedded but couldn't find it.
Then I came back to this forum and did a google search and couldn't find the answer.
So I came back to this forum, did a quick search and guess what I found!!! The answer.
There is no 'unlock' function. I was expecting to see a tic-box for this.
The fix is to change the password to anything other than what it was. The user can then log back in and change it back to what ever they want.
Ralph