exch2003 resource mailbox issues after exch2010 upgrades

Im running ex2003 and ex2010 in a co-existing env. I recently upgraded my EAP and Address lists to be compatible with ex2010. Now Im having issues with ex2003 resource mailboxes . When a user sets up a meeting and invites the resource as a resource the mail gets to the mailbox but it does not auto accept/decline it. It does not process it at all.
The resource mailbox and users are all on exch 2003. Im not sure how ex2010 would affect this?  The only changes I’ve made was upgrading the EAP and AL etc.
Any ideas?
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e_aravindConnect With a Mentor Commented:
so if the resource mailboxes are still located in the "Exchange 2003"

What is the direct booking option you have configured
a) Outlook as the booking agent
b) AutoAcceptAgent.

> can you try re-register the smtp mailbox\address again with the Autoacceptagent?

DEFclubAuthor Commented:
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