This is the list of Exchange versions, build numbers and release dates, starting with Exchange 2003:
| Version | Build | Released |
| 2003 RTM | 6.5.6944 | Oct2003 |
| 2003 SP1 | 6.5.7226 | May2004 |
| 2003 SP2 | 6.5.7638 | Oct2005 |
| 2003 Post SP2 | 6.5.7653.33 | Mar2008 |
| 2003 Post SP2 | 6.5.7654.4 | Aug2008 |
| 2007 RTM | 8.0.685.25 (or .24) | Dec2006 |
| 2007 RU1 | 8.0.708.3 | Apr2007 |
| 2007 RU2 | 8.0.711.2 | May2007 |
| 2007 RU3 | 8.0.730.1 | Jun2007 |
| 2007 RU4 | 8.0.744.0 | Aug2007 |
| 2007 RU5 | 8.0.754.0 | Oct2007 |
| 2007 RU6 | 8.0.783.2 | Feb2008 |
| 2007 RU7 | 8.0.813.0 | Jul2008 |
| 2007 SP1 | 8.1.0240.006 | Nov2007 |
| 2007 SP1 RU1 | 8.1.263.1 | Feb2008 |
| 2007 SP1 RU2 | 8.1.278.2 | May2008 |
| 2007 SP1 RU3 | 8.1.291.2 | Jul2008 |
| 2007 SP1 RU4 | 8.1.311.3 | Oct2008 |
| 2007 SP1 RU5 | 8.1.336.1 | Nov2008 |
| 2007 SP1 RU6 | 8.1.340.1 | Feb2009 |
| 2007 SP1 RU7 | 8.1.359.2 | Mar2009 |
| 2007 SP1 RU8 | 8.1.375.2 | May2009 |
| 2007 SP1 RU9 | 8.1.293.1 | Jul2009 |
| 2007 SP1 RU10 | 8.1.436.0 | Apr2010 |
| 2007 SP2 | 8.2.0176.002 | Aug2009 |
| 2007 SP2 RU1 | 8.2.217.3 | Nov2009 |
| 2007 SP2 RU2 | 8.2.234.1 | Jan2010 |
| 2007 SP2 RU3 | 8.2.247.2 | Mar2010 |
| 2007 SP2 RU4 | 8.2.254.0 | Apr2010 |
| 2010 RTM | 14.00.0639.021 | Oct2009 |
| 2010 RU1 | 14.0.682.1 | Dec2009 |
| 2010 RU2 | 14.0.689.0 | Mar2010 |
| 2010 RU3 | 14.0.694.0 | Apr2010 |
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