Thanks to Ben Ben-Ari for this great post

http://blogs.technet.com...s-available-for-uag.aspx

Version                            Release Date                             Version Number
Gold (no updates) 25         January 2010                      4.0.1101.0
Sec Update MS10-089        9 Nov 2010                         4.0.1101.052
Update 1                          12 April 2010                      4.0.1152.100
U1 Rollup 1                      18 May 2010                       4.0.1152.110
U1+Sec Update MS10-089  9 Nov 2010                         4.0.1152.150
Update 2                          21 September 2010             4.0.1269.200
U2+Sec Update MS10-089  9 Nov 2010                         4.0.1269.250
Service Pack 1 RC              21 October 2010                 4.0.1575.10000
Service Pack 1                   3 December 2010                4.0.1752.10000

If you have installed a certain update, you may be wondering how to know at what level you are at. To know this, you can click on the Help menu, within the UAG management console, and select About.