How do I display / audit SBS 2003 Exchange permissions?

I gave a user full access to her boss's exchange SBS 2003 Exchange account a few months ago (with his consent!), so she can view his email as another account in Outlook while he was away on a trip.
The weird thing is that even though I have now removed her permissions - by changing the Exchange Advanced tab under the bosses account - she still has access to his email through Outlook. She isnt in any security groups (so far as I can tell) that give her this access and I cannot trace how it is happening.
Is there a way to discover how she is getting this permission?

Edit:typo
actioncoAsked:
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gupnitConnect With a Mentor Commented:
Hi,
Please check if she has been delegated permissions via Boss's Outlook.
Let me know
Thanks
Nitin
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actioncoAuthor Commented:
It was the permissions on the mailbox itself in Outlook, where the user had been given "Owner" rights. Thank you!
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gupnitCommented:
Glad to help :-)
Thanks
Nitin
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milindnCommented:
You may want to check the publicdelegatesBL attribute on the secretary's user account in Active Directory. If this attribute contains the DN of her boss then she must be given a delegated permissions using outlook and she can add the mailbox as an addtional mailbox to her profile. Same thing can be checked in publicdelegates attribute of the manager.

another way to audit the mailbox permissions in your org is using ADMODIFY.net tool.

M
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milindnCommented:
Oops! Already answered and credited. Sorry for that guys.
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