Security Permissions keep disappearing!!!

Dont know whether this is the right place but here goes:

We have a 2000 domain with some 2003 servers in it as well. We have just installed a 2003 Exchange Ent Cluster which is working fine, however, it had SP2 installed and affected our Blackberry Server. We applied the SP2 hotfix and followed the instructions from the knowledge base and all seemed fine. Now we have tried to add another blackberry to the server and one of the actions is in the user profile in AD it to grant BES admin permissions to send as and receive as in the Security option. This is fine and the permissions are there and the blackberry works but after about 20 mins the permissions "disappear" and the blackberry is unable to send but can receive. I have changed it again and again and replicate but it still keeps happening and I dont know why it keeps losing the permissions. There are 3 DC on W2K Sever with all relevant patches etc applied. All the other blackberry's are working fine so I am at a loss. We have create a new user and that does the same thing. Does anyone have any idea why this is happening and what can be done to fix it?
goldsmithwilliamsAsked:
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oBdACommented:
This user is (or has been at one point) member of a "protected group" (Administrators, Account Operators, Server Operators, Print Operators, Backup Operators, Domain Admins, Schema Admins, Enterprise Admins, Cert Publishers); check here for details:
The "Send As" right is removed from a user object after you configure the "Send As" right in the Active Directory Users and Computers snap-in in Exchange Server
http://support.microsoft.com/?kbid=907434

Delegated permissions are not available and inheritance is automatically disabled
http://support.microsoft.com/?kbid=817433

AdminSDHolder Thread Affects Transitive Members of Distribution Groups
http://support.microsoft.com/?kbid=318180

Security tab of the adminSDHolder object does not display all properties
http://support.microsoft.com/?kbid=301188
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goldsmithwilliamsAuthor Commented:
While the send as etc is removed, should it remove the user from the list. I have removed users from the list which no longer exist (they being with S then a number) and added the BES admin user. After 20 mins or so the BESAdmin user disappears the users beginning S-xxx which no longer exist and were deleted reappear.
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oBdACommented:
Which "list" are you referring to?
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goldsmithwilliamsAuthor Commented:
The user profile in Active Director and the security tab when you add group or username access. I think what might be happening is permissions are not being inherited and overriden but thats just a thought.
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oBdACommented:
Then it seems like someone changed the properties of the adminsdholder object (iirc, it's described in one of the articles above), and added the (now deleted) users; if a user is deleted, it remains still in the ACLs of any resource where it had permissions.
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bevhostCommented:
On our server Power Users were part of the Print Operators Group.
SO, Power Users were also having the BESAdmin group removed.

I also read that the exchange message store must be restarted before or wait two hours for the cache to be discarded before the user could send.  I guess I'll know in two hours. (and by then I'll be offsite not returning for 5 days)

See also
http://support.microsoft.com/kb/912918
Users cannot send e-mail messages from a mobile device or from a shared mailbox in Exchange 2000 Server and in Exchange Server 2003
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