Version	Version (additional zeros removed)	Q	KB	KB / Description	Date Updated
6.0.6620.15	6.0.6620.15	Q976703	KB976703	976703 MS10-024: Description of the security update for Exchange 2000 Server: April 13, 2010	April 13, 2010
6.0.6620.9	6.0.6620.9	Q959239	KB959239	959239 MS09-003: Vulnerability in Microsoft Exchange could allow remote code execution	February 10, 2010
6.0.6620.7	6.0.6620.7			Exchange 2000 Server post-SP3	August 1, 2008
6.0.6620.5	6.0.6620.5			Exchange 2000 Server post-SP3	March 1, 2008
6.0.6617.47	6.0.6617.47			Microsoft Security Bulletin MS06-003: Vulnerability in TNEF Decoding in Microsoft Outlook and Microsoft Exchange Could Allow Remote Code Execution	January 10, 2006
6.0.6603	6.0.6603	Q870540	KB870540	870540 August 2004 Exchange 2000 Server Post-Service Pack 3 Update Rollup	August 16, 2004
6.0.6556	6.0.6556			Exchange 2000 Server post-SP3	April 1, 2004
6.0.6487	6.0.6487			Exchange 2000 Server post-SP3	September 1, 2003
6.0.6249	6.0.6249			Exchange 2000 Server Service Pack 3 (SP3)	July 18, 2002
6.0.5762	6.0.5762			Exchange 2000 Server Service Pack 2 (SP2)	November 29, 2001
6.0.4712	6.0.4712			Exchange 2000 Server Service Pack 1 (SP1)	June 21, 2001
6.0.4417	6.0.4417			Exchange 2000 Server RTM	November 29, 2000

You can comment here. If you know of a hotfix build or KB that we don't have listed here, please use the comments.