Exchange Server Build Numbers

Here is a list of all the Update Rollups and Service Packs that have been released for Exchange Server 2010/2013.

Exchange 2010

Update	Release Date	Build	Link
RTM	November 2009	14.0.639.21
UR1	December 2009	14.0.682.1	http://support.microsoft.com/kb/976573
UR2	March 2010	14.0.694.0	http://support.microsoft.com/kb/979611
UR3	April 2010	14.0.694.0	http://support.microsoft.com/kb/981401
UR4	June 2010	14.0.702.1	http://support.microsoft.com/kb/982639
UR5	December 2010	14.0.726.0	http://support.microsoft.com/kb/2407113
SP1	August 2010	14.1.218.15	http://technet.microsoft.com/en-us/library/ff459257(v=exchg.141).aspx
UR1	October 2010	14.1.255.2	http://support.microsoft.com/kb/2407028
UR2	December 2010	14.1.270.1	http://support.microsoft.com/kb/2425179
UR3	March 2011	14.1.289.3	http://support.microsoft.com/kb/2492690
UR3-v3	April 2011	14.1.289.7	http://support.microsoft.com/kb/2529939
UR4	June 2011	14.1.323.1	http://support.microsoft.com/kb/2509910
UR4-v2	July 2011	14.1.323.6	http://support.microsoft.com/kb/2579150
UR5	August 2011	14.1.339.1	http://support.microsoft.com/kb/2582113
UR6	October 2011	14.1.355.2	http://support.microsoft.com/kb/2608646
UR7	August 2012	14.1.421.0	http://support.microsoft.com/kb/2743248
UR7-v2	October 2012	14.1.421.2	http://support.microsoft.com/kb/2756496
UR7-v3	November 2012	14.1.421.3	http://support.microsoft.com/kb/2778158
UR8	December 2012	14.1.438.0	http://support.microsoft.com/kb/2787763
SP2	December 2011	14.2.247.5	http://technet.microsoft.com/en-us/library/hh529924(v=exchg.141).aspx
UR1	February 2012	14.2.283.3	http://support.microsoft.com/kb/2645995
UR2	April 2012	14.2.298.4	http://support.microsoft.com/kb/2661854
UR3	May 2012	14.2.309.2	http://support.microsoft.com/kb/2685289
UR4	August 2012	14.2.318.2	http://support.microsoft.com/kb/2706690
UR4-v2	October 2012	14.2.318.4	http://support.microsoft.com/kb/2756485
UR5	November 2012	14.2.328.5	http://support.microsoft.com/kb/2719800
UR5-v2	December 2012	14.2.328.10	http://support.microsoft.com/kb/2785908
UR6	February 2013	14.2.342.3	http://support.microsoft.com/kb/2746164
UR7	August 2013	14.2.375.0	http://support.microsoft.com/kb/2874216
UR8	December 2013	14.2.390.3	http://support.microsoft.com/kb/2903903
SP3	February 2013	14.3.123.4	http://technet.microsoft.com/en-us/library/jj965775(v=exchg.141).aspx
UR1	May 2013	14.3.146.0	http://support.microsoft.com/kb/2803727
UR2	August 2013	14.3.158.1	http://support.microsoft.com/kb/2866475
UR3	November 2013	14.3.169.1	http://support.microsoft.com/kb/2891587
UR4	December 2013	14.3.174.1	http://support.microsoft.com/kb/2905616
UR5	February 2014	14.3.181.6	http://support.microsoft.com/kb/2917508
UR6	May 2014	14.3.195.1	http://support.microsoft.com/kb/2936871

Exchange 2013

Update	Release Date	Build	Link
RTM	October 2012	15.0.516.32
CU1	April 2013	15.0.620.29	http://support.microsoft.com/kb/2816900
CU2	July 2013	15.0.712.22
CU2-v2	July 2013	15.0.712.24	http://support.microsoft.com/kb/2859928
CU3	November 2013	15.0.775.38	http://support.microsoft.com/kb/2892464
SP1	February 2014	15.0.847.32	http://support.microsoft.com/kb/2926248

Hope this helps!
~ Brad

Fun Fact:
The first webcam watched a coffee pot. It allowed researchers at Cambridge to monitor the coffee situation without leaving their desks.