Email migration from SBS 2003/EX03 to Server 2008/Ex20 and OWA

Posted on 2011-03-18
Last Modified: 2012-06-27
this weekend I plan on migrating mailboxes from EX03 to EX10.
I know that internal users will be able to access their email from within Outlook, whether the mailbox still resides on the EX03 server or has been moved to the EX10 server (because Exchange intelligently notifies the Outlook client of URL to the EX10 server).

But, what about external access to the mailboxes via OWA ?
While I am migrating mailboxes, will I need to provide two URL that maps to the Ex03 server and one that maps to the EX10 server?

Question by:cliffordgormley
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Expert Comment

by:Glen Knight
ID: 35168794
>>.one URL that maps to the Ex03 server and one that maps to the EX10 server?

Yes, which means you will also need to public IP addresses.  You will then need to configure the LegacyURL and Exchange 2010 will redirect any clients on the 2003 server automatically to the 2003 server without their input.

Author Comment

ID: 35169053
Hi demazter,
I am not sure what you mean by: Exchange 2010 will redirect any clients on the 2003 server automatically to the 2003   :)

I do not have two public ip addresses, so I plan on using the LegacyURL as is, using port 443 (https) to continue to point to the EX03 server (if all the mailboxes do not get moved over).

Then I plan on using another URL that I will have to provide to the external clients, that uses a port other than 443 (, which then redirects port 444 to the new Ex10 server's o[ address on port 443

Any constructive feedback is welcome!

LVL 74

Expert Comment

by:Glen Knight
ID: 35169136
You cant change the port in use by Exchange 2010 on SSL, you will need two public IP addresses if you plan to use the 2 systems together for any length of time.  If you don't then it's not a problem just move all the mailboxes and the problem goes away.

I'd be very surprised if the redirection will work with a Port change.

The LegacyURL must be configured to use the 2003 server.  All clients must come to a Client Access Server that is a 2010 server otherwise redirection will not work.

Author Comment

ID: 35169208
So how do you inform the EX10 server what the external ip is for the Legacy Exchange Server?
LVL 74

Accepted Solution

Glen Knight earned 500 total points
ID: 35169229
You done, you give it the URL which means you also need to configure an A record in your external DNS.

See here for further info:

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