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Outlook 2010 automatically adds additional mailboxes

Admin_FF asked
Last Modified: 2012-05-11

- client PC, conntected to PC
- logged in as domain user
- Outlook 2010, connected to Exchange Server 2010, current SP level for both
- no PST files active
- no cache or offline mode active, just online mode to Exchange
- added some additional Exchange mailboxes

The following happens:
I get connected to more Exchange mailboxes than wanted. I can remove them via Account settings and removing them from the Advanced tab "Open these additional mailboxes", which will remove them from the Outlook 2010 folder view once I clicked OK. However as soon as I closed ALL dialogs of the Account Setting dialog, these mailboxes automatically get re-added immediatly.
Where do they come from? Does O2010 or E2010 have some kind of automatism to auto-connect to additional mailboxes? Where do I find anything about that feature?
This never happened with E2000/2003/2007 and O2002/O2003/O2007.

Thanks in advance for any help.

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