I’ve seen several articles on the internet which list Exchange 2000 version information, others that list Exchange 2003 version information, but I’ve been searching for a while for a listing of ALL the versions.
Here some of the individual versions :
Exchange 2000
4417.5 = Exchange 2000 RTM
4629.1 = SBS 2000 Exchange 2000
4712.7 = Exchange 2000 SP1
5762.4 = Exchange 2000 SP2
6249.4 = Exchange 2000 SP3
6396.1 = Exchange 2000 Post-SP3 Super Roll-up
63xx/64xx = Exchange 2000 Post-SP3 Hotfixes
Exchange 2003
6944.4 = Exchange 2003 RTM (including SBS2003)
7226.6 = Exchange 2003 SP1
7638.2 = Exchange 2003 SP2
Exchange 2007
Exchange 2007 SP1 08.01.0240.006
Update Rollup 1 for Exchange Server 2007 Service Pack 1 8.1.263.1
Update Rollup 2 for Exchange Server 2007 Service Pack 1 8.1.278.2
Update Rollup 3 for Exchange Server 2007 Service Pack 1 8.1.291.2
Update Rollup 4 for Exchange Server 2007 Service Pack 1 8.1.311.3
Update Rollup 5 for Exchange Server 2007 Service Pack 1 8.1.336.1
Update Rollup 6 for Exchange Server 2007 Service Pack 1 8.1.340.1
Update Rollup 7 for Exchange Server 2007 Service Pack 1 8.1.359.2
Update Rollup 8 for Exchange Server 2007 Service Pack 1 8.1.375.2
Update Rollup 9 for Exchange Server 2007 Service Pack 1 8.1.293.1
Finally, I found a single link with all the versions (well nearly)
http://support.microsoft.com/kb/158530
There is a link from that which shows Exchange 2007 build information :
http://technet.microsoft.com/en-us/library/bb232170%28EXCHG.80%29.aspx