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Build Numbers and Release Dates for Exchange Server Products
In knowledge base article 158530 , Microsoft have published a list of all of their releases of Exchange server, starting from Exchange 4.0 back in 1996, and ending in the present with Exchange Server 2007 SP1.
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Each version of Microsoft Exchange Server has a different build number, and when installing Service Packs on Exchange Server, this build number changes. You can read more about finding the type of Exchange Server installation you’re using on my “What’s my Exchange 2003 SP Version?” article. The following table lists the build numbers and general release dates for each version.
| Microsoft Exchange Server 4.0 | 4.0.837 | April 1996 |
| Microsoft Exchange Server 4.0 (a) | 4.0.993 | August 1996 |
| Microsoft Exchange Server 4.0 SP1 | 4.0.838 | May 1996 |
| Microsoft Exchange Server 4.0 SP2 | 4.0.993 | August 1996 |
| Microsoft Exchange Server 4.0 SP3 | 4.0.994 | November 1996 |
| Microsoft Exchange Server 4.0 SP4 | 4.0.995 | April 1997 |
| Microsoft Exchange Server 4.0 SP5 | 4.0.996 | May 1998 |
| Microsoft Exchange Server 5.0 | 5.0.1457 | March 1997 |
| Microsoft Exchange Server 5.0 SP1 | 5.0.1458 | June 1997 |
| Microsoft Exchange Server 5.0 SP2 | 5.0.1460 | February 1998 |
| Microsoft Exchange Server | 5.5 5.5.1960 | November 1997 |
| Microsoft Exchange Server 5.5 SP1 | 5.5.2232 | July 1998 |
| Microsoft Exchange Server 5.5 SP2 | 5.5.2448 | December 1998 |
| Microsoft Exchange Server 5.5 SP3 | 5.5.2650 | September 1999 |
| Microsoft Exchange Server 5.5 SP4 | 5.5.2653 | November 2000 |
| Microsoft Exchange 2000 Server | 6.0.4417 | October 2000 |
| Microsoft Exchange 2000 Server (a) | 6.0.4417 | January 2001 |
| Microsoft Exchange 2000 Server SP1 | 6.0.4712 | July 2001 |
| Microsoft Exchange 2000 Server SP2 | 6.0.5762 | December 2001 |
| Microsoft Exchange 2000 Server SP3 | 6.0.6249 | August 2002 |
| Microsoft Exchange 2000 Server post-SP3 | 6.0.6487 | September 2003 |
| Microsoft Exchange 2000 Server post-SP3 | 6.0.6556 | April 2004 |
| Microsoft Exchange 2000 Server post-SP3 | 6.0.6603 | August 2004 |
| Microsoft Exchange Server 2003 | 6.5.6944 | October 2003 |
| Microsoft Exchange Server 2003 SP1 | 6.5.7226 | May 2004 |
| Microsoft Exchange Server 2003 SP2 | 6.5.7638 | October 2005 |
| Microsoft Exchange Server 2007 | 8.0.685.24 or 8.0.685.25 | December 2006 |
| Microsoft Exchange Server 2007 SP1 | 8.1.0240.006 | November 2007 |
To view the build number of the server that you are using, see the properties of the server object in the Exchange Management Console.
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