Last hiccup to successfuly migrate to Zimbra

[Labrador]

Hi there,
I am looking for a little guidence to finalise a migration from Exchange 2003 to Zimbra.

My Server Details:
Windows 2003 (MS Exchange 2003 SP2)
Ubuntu 6.0.6 Server (Zimbra 4.5.9)

I have had some success with the migration of accounts but still receive an RPC error which is preventing any further data transferring. If I log on to the Zimbra Admin Console I can see the new account names have been created using the ZCS Migration wizard from Exchange to Zimbra. I can access the accounts via the Zimbra web interface.

I did check to see the RPC service is running on the Exchange 2003 server and it appears to be started and running.

Look forward to hopefully hearing from someone who can answer my problem.

Kindest Regards
Labrador