Back in September 2012, we communicated broadly on Forefront product roadmap changes.
At this time, we would like to remind you that Forefront Threat Management Gateway (TMG) Web Protection Services will be discontinued on December 31st, 2015. There will be no further updates to this URL filtering/categorization service beyond this date.
The gateway product itself, Forefront Threat Management Gateway 2010, will remain under extended support until April 14, 2020.
Microsoft is committed to secure application publishing. Learn more on how to move from TMG to our new solutions here: http://blogs.technet.com/b/applicationproxyblog/archive/2015/07/02/transitioning-to-application-proxy-from-uag-and-tmg.aspx