Check which Update Rollup version is installed on your CRM environments

Browse to the CRM website.
Click on the “Help” button on the top right side of the window.
Click on “About Microsoft Dynamics CRM”
Get the build number displayed as follows else the image in side.

Version Build Number Released on
RTM 4.0.7333.3 12/19/2007
Update Rollup 1 4.0.7333.1113 11/24/2008
Update Rollup 2 4.0.7333.1312, 4.0.7333.1316 1/15/2009, 2/8/2009
Update Rollup 3 4.0.7333.1408 3/12/2009
Update Rollup 4 4.0.7333.1551 5/7/2009
Update Rollup 5 4.0.7333.1644, 4.0.7333.1645 7/2/2009
Update Rollup 6 4.0.7333.1750 9/27/2009
Update Rollup 7 4.0.7333.2138 10/22/2009
Update Rollup 8 4.0.7333.2542 12/17/2009
Update Rollup 9 4.0.7333.2644 2/11/2010
Update Rollup 10 4.0.7333.2741 4/8/2010
Update Rollup 11 4.0.7333.2861 6/25/2010
Update Rollup 12 4.0.7333.2935 8/2/2010

Roll up 13 also has been come, will udate that latter.

Sudhanshu