Unable to open other users mailboxs

I am the exchange administrator trying to open other users mailbox in outlook 2003.  I have added myself as an Exchange Full Administrator.  Added myself to the server itself as an administrator, the information store, and database.  I am also a member of the domain and enterprise admins.  I can see on the users AD properties that I have full access, but when i try to open their mailbox I get "cannot expand folder".  If i go to the mailbox and right click the mailbox and go to properties I get "the set of folders cannot be opened".  I am also not able to open the folder using open other users folder.  This is happening for most of the users but a couple of mailboxes will allow me to open them.  
Bwberg77Asked:
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NpatangCommented:
Make sure in AD you go into the User properties > exchange Advanced and mailbox rights. and make sure you add your self there and give the full access rights
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Bwberg77Author Commented:
I can see on the users AD properties that I have full access and they are inherited.  I have also tried to remove the inherited rights and add myself but the same result.
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MrLonandBCommented:
Go into the properties of the mailbox store and then to the permissions tab. Double-check that there is not a deny for "send as" and "receive as" for the "Domain Admins" group. I am guessing that you are a member of Domain Admins and those permissions are denied by default.
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NpatangCommented:
In the same note what MrLonandB: suggested, if yuou don't want to do that try removing your account from the domains Admin, Enterprise Admins as well.
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Bwberg77Author Commented:
I went into the mailbox store properties and checked there are no deny permissions for either the domain admins or enterprise admins on the send as or receive as.  The only place that had them was the server under the first storage group.  I have removed them from there and i still get the same result.  
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Bwberg77Author Commented:
I also tried to remove myself from the domain admins and enterprise admins and same result.
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MrLonandBCommented:
Just to double-check. After you did those things, did you disconnect the mailboxes from Outlook, close Outlook, re-open and add the boxes back again?
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Bwberg77Author Commented:
I didn't do that before so I went back and tried it, but the same result.
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SurajCommented:
add your self on the store and give it a send as and receive as permission.
then restart the microsoft exchange SA service
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Bwberg77Author Commented:
Well I already had myself on there with those rights.  I saw that the exchange domain server group had the deny on the received as.  Unchecked that, then restarted the exchange SA service and now it seems to be working.
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