Exchange 2003 to Exchange 2010 migration with 2 different domains
Posted on 2011-02-23
I recently installed exchange 2010 in a new domain, I have exchange 2003 installed in a completely seperate domain. I can't migrate all at once. I would like to gradually migrate users from exchange 03 to 2010. In exchange 2003 you can forward unresolved recipeint mail to another location....so what i did was point this to my new exchange 2010 server in hopes that once a moved the user off the exchange 03 server, the user would no long resolve and the mail would be forwarded along to the new exchange 2010 server. My external MX record points to my Exchange 03 server. Is it possible to point my MX record at the exchange 2010 server an relay/forward unresolved reciepinets to the exchange 2003 server?
email domain is the same xyz.com
internal domain is different exchange 03 sits on abc.local exchange 2010 sits on pqr.local
i'm exmerging the PST's so this is not an issue
I use postini, so i can point the the delivery at either exchange server
the issue is I can recieve mail on one or the other but not both. users on abc.local will recieve mail if I point postini at that exchange 03 server
Users on pqr.local will recieve mail in exchange 2010 when i point postini at that server
I see the unresolved reciepient sending from exchange 03 to my exchange 2010 server but the message never arrives...
let me know if you need more info...