| Version | Codename | Build Number | Release date |
| Exchange Server 4.0 Exchange Server 4.0(a) Exchange Server 4.0 SP1 Exchange Server 4.0 SP2 Exchange Server 4.0 SP3 Exchange Server 4.0 SP4 Exchange Server 4.0 SP5 |
Touchdown | 4.0.837 4.0.993 4.0.838 4.0.993 4.0.994 4.0.995 4.0.996 |
April 1996 August 1996 May 1996 August 1996 November 1996 April 1997 May 1998 |
| Exchange Server 5.0 Exchange Server 5.0 SP1 Exchange Server 5.0 SP2 Exchange Server 5.5 Exchange Server 5.5 SP1 Exchange Server 5.5 SP2 Exchange Server 5.5 SP3 Exchange Server 5.5 SP4 |
Osmium | 5.0.1457 5.0.1458 5.0.1460 5.5.1960 5.5.2232 5.5.2448 5.5.2650 5.5.2653 |
March 1997 June 1997 February 1998 November 1997 July 1998 December 1998 September 1999 November 2000 |
| Exchange 2000 Server Exchange 2000 Server(a) Exchange 2000 Server SP1 Exchange 2000 Server SP2 Exchange 2000 Server SP3 Exchange 2000 Server post-SP3 Exchange 2000 Server post-SP3 Exchange 2000 Server post-SP3 |
Platinum | 6.0.4417 6.0.4417 6.0.4712 6.0.5762 6.0.6249 6.0.6487 6.0.6556 6.0.6603 |
October 2000 January 2001 July 2001 December 2001 August 2002 September 2003 April 2004 August 2004 |
| Exchange Server 2003 Exchange Server 2003 SP1 Exchange Server 2003 SP2 |
Titanium | 6.5.6944 6.5.7226 6.5.7638 |
October 2003 May 2004 October 2005 |
| Kodiak | 7.0 | 2005 | |
| Exchange Server 2007 Exchange Server 2007 SP1 Exchange Server 2007 SP2 |
Exchange 12 | 8.0.685.24(25) 8.1.0240.006 8.2.0176.002 |
December 2006 November 2007 October 2009 |
| Exchange Server 2010 Exchange Server 2010 SP1 |
Exchange 14 | 14.00.0639.021 14.x.x.x |
October 2009 |
| Exchange Server 2012 | x.x.x.x |