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Exchange 2003 to Exchange 2010 migration with 2 different domains

Posted on 2011-02-23
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Last Modified: 2012-06-27
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?  
notes:
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...

Thoughts?  

let me know if you need more info...
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Question by:naiadmin
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Accepted Solution

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Viral Rathod earned 500 total points
ID: 34959888
1) Add both the domain to Authoritative Accepted Domain
2) Make sure receive connector has anonymous access permission
3) Point Postini to exchnage 2010

There is no need to configure anything in exchnage 2003 (Exchange 2003 to Exchnage 2010 Mailflow will work by default)

http://filedb.experts-exchange.com/incoming/2011/02_w08/409252/rapid-transition-guide-from-exch.pdf
http://www.msexchange.org/articles_tutorials/exchange-server-2007/management-administration/managing-receive-connectors-part1.html
http://www.petri.co.il/authenticated-or-anonymous-smtp-relay-with-exchange-2007.htm
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Author Comment

by:naiadmin
ID: 34967656
viralrathod Thank you for the feedback...I may not have explained my situation very well...it was a long day.  

anyway - we are simply moving the email from an exchange 2003 org to a new exchange 2010 exchange org.  
so we are not installing exchange 2010 into an exchange 2003 org.
during this process we need allow mail to be passed from the exchange 2010 server to the exchange 2003 server during the migration.
for example we have 25 users....if i move 15 users from the exchange 2003 server to the exchange 2010 server and i point postini to the exchange 2010 server....the 10 users on the exchange 2003 server will still need to recieve their mail there until i'm able to migrate them.

  I will go the other way....move 15 users to the exchange 2010 server, leave postini pointed at the exchange 2003 server, set the unresolved reciepient forward to the exchange 2010 server until all users have been moved, then point postini to the exchange 2010

issue is....either way the mail does not arrive at the other exchange server?? i have to be missing something simple...i get a delivery reciept as external mail arrives at an exchange server...users local to that server recieve their mail...but the users on the remote exhange server never recieve their mail...

is is maybe a filter in exchange 2010 that is dropping the messages?  I will check he exchange filters...
thoughts?
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Author Comment

by:naiadmin
ID: 35160102
I was able to resolve the issue...I had the spam filtering set to drop users not in AD (opps, my bad)...this was dropping the mail for users not yet migrated to the new solution...
so my config was point MX at exch2010 server set up an internal relay....sites are nailed up with IPSEC tunnel so i used the private IP address in the relay.  the following link provided me with info and got me started...
http://telnet25.wordpress.com/2010/08/08/internal-relay-domain-forward-all-mail-with-unresolved-recipients-to-host/

thx
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Author Closing Comment

by:naiadmin
ID: 35160130
Thx Viralrathod...this got me moving in the right direction...
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