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farrnateFlag for United States of America

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Exchange 2003 to 2010 Coexist SAN

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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Radweld
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Also check out this blog, it's a bit more comprehensive,

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