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Exchange 2003 to 2010 Coexist SAN

Posted on 2013-06-10
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Last Modified: 2013-07-09
Exchange 2003 as primary domain controller
New Exchange 2010 installed with all roles

SAN cert from digicert in hand:
mail.domain.com
autodiscover.domain.com
legacy.domain.com

We currently use a self signed SSL
I have a separate public IP for the Exchange 2010 server
I have an old ISA server but all it is doing is webpage proxy.  
I have not made any changes except to look at replication of free+busy to the new server

What I need help with is order of events to coexist from here.  I'm thinking:

1 Install the new SAN on Exchange 2010 then export to old 2003
2 Change public DNS to point to the new 2010 IP address (should I assign legacy.domain.com to the current public IP? It is the PDC and it will remain until the Old Exchange 2003 can be rooted out)

I think I'm on the right track but could really use some advice prior to digging any holes for myself
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Question by:farrnate
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Radweld earned 1500 total points
ID: 39236973
Hi there,

You are essentially correct, you switch your OWA,AES endpoints to Exchange 2010 (can be done via ISA) and if Exchange identifies the mailbox as still existing on Exchange 2003, sends a redirect to the client and issues the legacy namespace. It's common to use legacy.domain.com for example however the legacy name can be anything.

I have used a new namespace for Exchange 2010 once before and left the original namespace as it was, this means clients don't actually need to be redirected and no certificates need to change however a new url needs to be passed to the users when their migrated.

The following blog highlights the general steps involved with coexisting.

http://ilantz.com/2010/03/12/how-to-publish-exchange-2003-and-exchange-2010-with-isa-2006/

Hope this helps.
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Expert Comment

by:Radweld
ID: 39236975
Also check out this blog, it's a bit more comprehensive,

http://blogs.technet.com/b/exchange/archive/2009/12/17/3409102.aspx
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