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I have a user who has two Exchange mailboxes in Outlook that cannot be removed. In fact I'm not sure why they are there at all because I cannot find evidence within Outlook's Accounts settings for these mailboxes.

I cannot right-click -> Close these two "Enquiries" mailboxes, Outlook advises to remove them from the Accounts settings:

Outlook mailboxes that cannot be closed

There is only one Exchange mailbox under Outlook Accounts, plus no additional Mailboxes added:

Additional mailboxes

Can someone please help?

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Delete the Outlook profile entirely, and create a new one. To be sure, empty out the Outlook folder under AppSettings as well (I'm not sure of the exact location, but it'll be the one containing the OST files). – user3463 Sep 12 '12 at 3:13
I had tried that - deleted Outlook profile & renamed the Outlook folders under Local\AppData & Roaming\AppData. – Ash Sep 14 '12 at 4:09
Last resort: there are a couple of registry branches you'll have to nuke as well then. Unfortunately I'm nowhere near a Windows machine right now, but it's under HKCU. Search for the account name or in your case, "Enquiries". There's the usual Microsoft\Outlook structure there. You'll know it when you see it. Make sure Outlook isn't running (check Task Manager to be sure.) – user3463 Sep 14 '12 at 7:13
Thanks Randolph I'll give that a go. – Ash Sep 17 '12 at 5:24
Thanks for coming back with an update. – user3463 Sep 26 '12 at 4:50

The other mailbox that appeared out of nowhere was "autodiscovered" by outlook because the current user has "Full access" to that secondary mailbox. Outlook is trying to be helpful.

-Tom Dragonetti

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