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Migrating server from Exchange 2003/Windows Server 2003 to Exchange 2007/Windows Server 2008

We want to migrate our Exchange Server from 2003 to 2007.  We're also migrating from Windows Server 2003 to 2008.  This box is also a domain controller.

Can someone provide the best process to follow to accomplish these migrations?
Thanks much for your help.
3 Solutions
There is no inplace upgrade from 2003 to 2007. You will have to have another server too and will be in a coexistence for some time.
Refer: http://www.msexchange.org/tutorials/Transitioning-Exchange-2000-2003-Exchange-Server-2007-Part1.html
Nitin Gupta
My recommndations: migrate to exchange 2007 on a new server (build a new server , install exchange 2007 join in mixed mode with exchange 2003, move all stores to new server , test integrity and few mailboxes connectivity and than remove exchange 2003 from old box). Keep the old box as domain controller and keep the exchange 2007 server as a memeber server (dont make it a domain controller). For the 2008 upgrade, once again unless you have a backup domain controller along with all the roles (GC, RIP etc) assigned , do a move upgrade not inplace.
Rajith EnchiparambilOffice 365 & Exchange ArchitectCommented:
Buy a new server, 64bit capable with 2008 64bit OS.

Add it to the domain as a member server.

Install exchange 2007 prerequisites and then run 2007 setup.

Check http://www.howexchangeworks.com/2009/06/installing-exchange-2007-pre-requisites.html
cclausen1Author Commented:
Together, the three recommendations present a thorough solution.

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