The address list cannot be displayed

I am in the process of transitioning from Exchange 2003 SP2 (Ex2k3) to Exchange 2010 SP1 (Ex2k10) and have so far achieved the following:-

(1) Ex2k10 is installed & opertaional (normal)
(2) Majority of the mailboxes are still on Ex2k3 server, few mailboxes are on Ex2k10
(3) DNS server has following entries:-
(4) Clients are a mix of Outlook 2003 & Outlook 2010

Ex2k3 server, IP:, FQDN:
Ex2k10 server, IP:, FQDN:

If i try to configure a new profile (even for a user residing on Ex23k server) i get below error message:-

"The address list cannot be displayed. The connection to Microsoft Exchange is unavailable. Outlook must be online or connected to complete this action."

This happens when i try to open the GAL, this user can still send/receive emails.

Please advise.

Who is Participating?
FadalConnect With a Mentor Author Commented:
Yes the OAB generation server is Ex2k10, all Outlook 2003 clients mailboxes are still located on Ex23k so i dont use the encyption setting for these clients (dont need to).

I know the problem but i guess there is no way around it, it is basically a DNS issue which needs an A record on my DNS server pointing to Ex2k10 server ( but my existing Ex23k server's FQDN is ( so i cant put that A record on my DNS server.

What im doing now is creating a hosts file entry on local machine ( and it works as a workaround.
Have you changed the OAB generation server yet? If so have you checked the 'encrypt data between Microsoft Outlook and Microsoft Exchange' checkbox in Outlook? It is located in more settings/security tab.
FadalAuthor Commented:
This is a workaround but not a solution
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