Exchange 5.5 to Exchange 2003 migration (orginally unknown)

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Here are the configurations:

1. Exchange 5.5 SP4 runing on Windows 2000 SP4.

2. First Exchange 2003 SP1 server, which is runing ADC and SRS joined to
Exchange 5.5 orginization.

3. Second Exchange 2003 SP1 server as mailbox storage server joined to
Exchange 5.5 orignization afterwards.

Population of NT 4.0 to AD and ADC are all working fine.

Moved mailbox to the first exchange 2003 (master), all the incoming/outgoing
and internal/external communciation are all OK.

When I move mailboxes to the second exchange server. Exch 5.5 client can
send email to exch 2003 client without a problem and external
incoming/outgoing email work fine as well.


But when I am trying to send emails to an exchange 5.5 client, from an
exchange 2003 client. turned on email tracking on exch
2000 box, and get the following "message rerouted to site
connector <domain> (orginally unknown). It's getting sent
to the right NT4.0 domain (so it seems), but the exch 5.5
client never sees the email.

I checked the queue on the Exch 2003 side, all of them are stuck in the
X.400 Exchange MTA outgoing queue. The queue state is showing as retry
instead of ready.

Urgent! any ideas would be greatly apperciated.




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