Grant access to another users mailbox on a different Exchange server on the same domain

Hi,
I have two Exchange servers on the one domain one 2003 and one 2010 - a number of users on the 2003 Exchange server need access to their colleagues account on the 2010 Exchange server (they also need to access other users on the 03 server but that's not a problem).  How can I got about giving them access as going into Account Setting and Advanced doesn't work as I can't specify the other server.
Thanks
t38Asked:
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Simon Butler (Sembee)ConsultantCommented:
The fact that you have two servers is completely immaterial.
The server is just a place to hold the mail, it has no impact on permissions. Therefore I don't know where you are looking to set the permissions.

You need to grant full access to a user on Exchange 2010, do so in the usual way through EMC or EMS.
If you need to grant full access to a user on Exchange 2003, use ADUC to grant the permission.

Mailbox permissions are just AD, they aren't controlled by Exchange at all.

Simon.
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t38Author Commented:
Thanks for your input -- I've added Full Access Permission for myself via EMC but I'm still see the attached when I attempt to open the uses mailbox from my own account...
mailbox-error.jpg
ADUC-Error.JPG
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t38Author Commented:
Please ignore the ADUC-Error, it's irrelevant.
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