Outlook 2007 Can't expand Folders

I am trying to open another users exchange 2007 mailbox in Outlook 2007.  I have added it as an additional mailbox to open in Outlook.  When trying to open the their folder (clicking the + sign) I get a message "Can't expand folders".  I am the admin and have set myself to have full access permission the their mailbox, closed Outlook, Re-booted.  No luck.  I try giving myself full permission to another users mailbox and it popped right up with not problems.  I have deleted my local ost file and let Outlook re-build it, still no luck.  Any suggestion of what to try next?

Thanks
JeffMCCAsked:
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Chris HInfrastructure ManagerCommented:
You have to set sub folders security in addition, one-at-a-time also.  Or, your exchange admin could give you READ permission on the organization level.
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JeffMCCAuthor Commented:
I am the admin and have given myself "FullAccess" to the user mailbox.  I have made the same change to other user's mailboxes, and they all work fine.  There has to be something specific to this user, I just can't figure out what.
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Chris HInfrastructure ManagerCommented:
Can you log in as the user in their profile and right click each of their sub folders and make sure you haven't been explicitly denied?  Also, I think it's schema admin or Enterprise admin that is explicitly denied from this.  So you may have "too much" access.
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JeffMCCAuthor Commented:
Can't log in as user at this point. (Business reasons not technical).  If it is a problem with Schema or Enterprise admin, shouldn't be causes this same problem for other users?
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Chris HInfrastructure ManagerCommented:
Yes.  You wouldn't be able to read anyone else's email if so.

But, I believe there is a way for the end user to override everything, even AD READ permission, if they explicitly deny you at the folder level.  Without being able to log in or recreate the users outlook profile, I'm not sure how to do so.
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JeffMCCAuthor Commented:
I'm 98% sure this user would have no clue how to block admin access or even have an idea that it's possible to make them research it.  Is there anyway to override without the user password or resetting it?
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JeffMCCAuthor Commented:
Not sure if this helps, but in the Exchange Management Console,  The mailbox I'm trying to open show me as the last one to log in.
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JeffMCCAuthor Commented:
Got it fixed.  There was  "Deny", "FullAccess" for "Domain Admins".  I have know idea how it got there.  In Exchange Power Shell, I used:  "Get-MailboxPermission mailbox |fl" to list all the permissions.  
Then used: Get-user -Identity "mailbox" | Remove_MailboxPermission -User "DOMAINANAME\Domain Admins" -Deny -InheritanceType 'All' -AccessRights 'FullAccess'.

The link below pointed me in the right direction:

http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/Q_27453413.html
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Chris HInfrastructure ManagerCommented:
Sorry, that's what I meant by too much access initally.  By default, I knew one of the admin accounts is explicitly denied (in this case domain admin).  Glad you got it worked out!
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JeffMCCAuthor Commented:
Thanks for your help.
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JeffMCCAuthor Commented:
Never got the final solution from an Expert.
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