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Outlook 2010 - can't remove extra mailboxes

Recently, it seems every time I add another user's mailbox to my outlook, I'm stuck with it forever.
Just today, I added another user's mailbox by going into file --> account settings, opening the properties of my mailbox, and adding in their mailbox.
When I was done, I went back in there and removed it.  The mailbox disappeared.
However, when I closed outlook and reopened it, the mailbox was back.  I went into the account settings but now I doesn't show I have any other mailboxes added.
If I right-click the account and choose close, it says I must close it be doing the above procedure.  

I've had this problem with other mailboxes and now I have around 10 mailboxes that sync everyday and I can't seem to get rid of them.  I'm tried deleting and recreating my mail profile.  The first time it's fine, but then after I close and reopen outlook, the other mailboxes appear.

I also sync my outlook from my home computer to my exchange account and it just added the new mailbox there as well.

The Exchange server is 2010 SP1, update rollup 2.
1 Solution
Try outlook /safe and see if you can remove the additional mailbox then close and reopen Outlook /safe and see if the additional mailbox is gone or not.

It may be an add-in causing this issue
winshuttleAuthor Commented:
That did not make a difference.  I just tried a different computer running Outlook 2010 in non-cached mode.  It showed the mailbox so I removed them.  After restarting outlook, they came back again and now I'm not able to remove them anymore.

I'm thinking the problem is on the Exchange server.
Apparently its a feature of Exchange 2010 SP1 and Outlook 2010:

Heres how to fix it:
So far what I've found to work is having to go into ADSIEdit.msc, Domain context, and drill down to the account you wish to be removed from, and look for the "MSExchDelegateListLink" attribute and remove yourself from that list.  The next time you start Outlook 2010, the ghost "additional" mailbox should disappear after a few minutes.

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winshuttleAuthor Commented:
That worked great!
No problem, I learnt something new there. Thanks for the points.
I had the same issue for several users.

I found this as a solution:

1.      On host machine that is having the issue, close outlook.
2.      Remote onto Exchanger server remove full access permission from the specified accounts
3.      Run>gpupdate /force on Exchange

4.      Back to host PC. Run>gpupdate /force on host PC (Y to log off)
5.      Open outlook
6.      User will not have permissions to access any folders or contents
7.      Allow for AD replication (few minutes)

After around 5 minutes I closed down outlook and reopened. The additional mailboxes had disappeared.

No clean profiles no ADSIEdit.msc involved.

Thought I would share how I resolved my issue.
MegaNuk3's solution worked perfectly.  Thanks!
So can't one just go into Exchange Management Console, Right click on the user, Manage Full Access Permission and add/remove the user?

Personally I had an account that I couldn't get rid of in my Outlook. I was ready to go in and edit the Registry but didn't. Then I noticed that Manage full Access, edited it out, restarted Outlook and 2 minutes later the account just disappeared out of it.
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