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Looking to upgrade Exchage 2000 to Exchange 2003 or 2007 but still have AD 2000

Last Modified: 2013-12-24
I want to accomplish two things, but not necessarily at the same time.  I am looking to upgrade our exchange environment which is exch 2000, and would like to upgrade to exch 2003 or 2007.  the current exch server is currently running win 2000 sp4.  The domain is AD 2000.  Nothing has been prepared yet.  Current AD environment:

1 native mode domain that houses 320 users
-server1 = Win 2k DC (root DC, Global Catalog, schema holder, print server, primary internal DNS, DHCP, WINS)
-server2 = WIN 2k DC (other DC in another building, print server secondary internal DNS)
-server3 = WIN 2k Exchange 2000 (only one exchange server)
-There is no ADC, but there was one at one time which was needed for exch 5.5 migration which is also gone.  That predates my employment.
-mixed Win2k and Win2003 member servers

I have done a ton of reading and have seen many ways of doing AD and exchange upgrades.  I already purchased two excellent servers in the event i need them for either AD 2003 or Exchange 2003 upgrade.  I currently have a test environment that is ready to go, but not sure which direction to go in.  There was one post that mentioned that I should upgrade my domain before exchange.  There was another post that mentioned doing exchange first.  Now I'm unsure where to start.
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