Below you will find the Forefront Threat Management Gateway 2010 version numbers and their corresponding updates.
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Note The 'Hotfix download available' form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language. Prerequisites To install this update, you must be running Forefront Threat Management Gateway 2010 Service Pack 2. Sep 27, 2011 Below you will find the Forefront Threat Management Gateway 2010 version numbers and their corresponding updates. To find the version of TMG you are using, in your MMC, go to Help, and then 'About Forefront Threat Management Gateway' RTM, Service Pack, Rollup Version Reference TMG 2010 RTM 7.0.7734.100 Service Pack 1 7.0.8108.200.
Nov 15, 2009 Forefront Threat Management Gateway 2010 allows employees to safely and productively use the Internet without worrying about malware and other threats. Forefront Threat Management Gateway 2010 is available for download in both Standard Edition and Enterprise Edition. Oct 10, 2011 Microsoft® Forefront Threat Management Gateway (TMG) 2010 Service Pack 2 (SP2) introduces new functionality to Forefront TMG 2010 Standard and Enterprise Editions. Details Note: There are multiple files available for this download.
To find the version of TMG you are using, in your MMC, go to Help, and then 'About Forefront Threat Management Gateway'
Rollup 3 for TMG 2010 SP2 7.0.9193.575 http://support.microsoft.com/kb/2735208
Rollup 4 for TMG 2010 SP2 7.0.9193.601http://support.microsoft.com/kb/2870877
Rollup 5 for TMG 2010 SP2 7.0.9193.644 http://support.microsoft.com/kb/2954173/en-us
Note: As someone pointed out in the comments there is an order that should be followed for a brand new install.
1.) RTM
2.) Service Pack 1
Tmg 2010 Download File Size Limit
3.) Update 1 for Service Pack 1
4.) Service Pack 2
Download Forefront Tmg 2010
5.) Latest rollup for Service Pack 2 (at time of writing it is Rollup 5)