Additional mailboxes appear in the left pane in Outlook

We have a setup with two account forests and an Exchange Ressource Forest.

Unfortunately I have som users who have all our RoomMailboxes listed in the left pane in Outlook.
By mistake they where given FullAccess permissions on the RoomMailboxes and therefor they automatically appeared.

I have fixed the permissions so they no longer have FullAccess.

But... how do I remove them now? I have tried to manually remove them by right clicking and select delete, but that won't work.

I have tried to delete their profile, but they just reappears.

Could it be a registry setting?
Kasper KatzmannSeniorkonsulentAsked:
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suriyaehnopCommented:
You may try go to Tool | Account Settings | Change | Modify | click Advanced tab | select the room mailbox and click remove
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Kasper KatzmannSeniorkonsulentAuthor Commented:
Sorry, forgot to mention that one. Been there as well.
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suriyaehnopCommented:
You may try this, using ADUC to open attributes for room mailboxes. Look for attributes "msExchDelegateListLink". msExchDelegateListLink will show the name of mailbox allowed to open shared mailbox.

You may empty this attributes
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Kasper KatzmannSeniorkonsulentAuthor Commented:
Thats it :-)
msExchDelegateListLink does it. Thanks!!!
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Kasper KatzmannSeniorkonsulentAuthor Commented:
Found this site, that shows how to clear the values from all users (I applied a filter to narrow the output).

http://blog.glo-networks.com/2012/01/12/removing-automapped-exchange-2010-mailboxes-in-outlook-pre-sp2/
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