Cannot change mailbox rights in Active Directory

Ok I just installed Exchange admin tools for Ex Server 2003 on my computer.  The exchange tabs do show up when opening user properties in Active directory, but I keep receiving an error when trying to open the Mailbox Rights under the Exchange Advanced tab. I get en error popup with the dreaded red x button.  This is the error I receive:

There is no such object on the server.
Facility: LDAP Provider
ID no: 80072030
Microsoft Active Directory - Exchange extensions.

I have the admin pack and IIS installed and configured according to specs.  It is running on a Windows XP machine SP2 and SP3 is installed.  
The install directions says SP2 is required to run, however I've been reeding around and supposedly SP3 works fine on this.  If anyone can prove me wrong, I'll try uninstalling that..but that'll be annoying for sure :P

Anyone have ideas?
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do you get the error if you ran it on the server itself?
L3370Author Commented:
unfortunately I cannot check that.  Our exchange servers are hosted externally. I just have permissions to modify accounts thru ADUC.  I'm new here so they suggested that i reinstall the exchange tools in the event it was an error on my computer.  I'm still pretty sure its something on my end because I am able to edit any other property without error.
L3370Author Commented:
Rights were changed. Had to get rights assigned to account.

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