I don't know who started this list first, but it is useful for me. I thought that I would put it out there for everyone to use. I’ve added some versions that weren’t on it originally and made some corrections as well. If you find that this list is wrong or out of date, let me know and I’ll update it. The list is sorted by RTM date.
Release Name
Version
RTM Date
Supported
Extended Support
Exchange 2003 SP1
06.05.06.7226
05/25/2004
Yes
Exchange 2003
06.05.04.6944
06/30/2003
Exchange 2000 SP3
06.00.04.6249
07/18/2002
Exchange 2000 SP2
06.00.04.5762
11/29/2001
No
Exchange 2000 SP1
06.00.07.4712
06/21/2001
Exchange 2000
06.00.05.4417
11/29/2000
Exchange 5.5 SP4
05.05.23.2653
11/01/2000
Yes until 31-Dec-05
Exchange 5.5 SP3
05.05.23.2650
09/09/1999
Exchange 5.5 SP2
05.05.01.2448
12/23/1998
Exchange 5.5 SP1
05.05.18.2232
08/05/1998
Exchange 4.0 SP5
04.00.72.996
05/05/1998
Exchange 5.0 SP2
05.00.13.1460
02/10/1998
Exchange 5.5
05.05.06.1960
11/05/1997
Exchange 5.0 SP1
05.00.00.1458
06/18/1997
Exchange 4.0 SP4
04.00.54.995
03/28/1997
Exchange 4.0 SP3
04.00.00.994
10/29/1996
Exchange 4.0 SP2
04.00.00.993
07/19/1996
Exchange 4.0 SP1
04.00.00.838
05/01/1996
FYI - You can get an updated version of this, including other Microsoft server products, here: http://support.microsoft.com/gp/lifesrvr ;-)
Yeah, that's why "Supported" and "Extended Support" link back to http://support.microsoft.com/gp/lifeprode. :) The file versions are the main reason I posted this. When someone is running the RTM version of Exchange 2003 and they are having performance problems or Store crashes, I just kinda want to freak out.
Actually there's a MS KB article listing the Exchange versions and builds as well: Build numbers and release dates for Exchange Server: http://support.microsoft.com/kb/158530