It has been awhile since I talked about TMG here, but the fact of the matter is that one of the most important TMG services is coming to an end in December 31st 2015. As you know TMG uses Microsoft Reputation Services (MRS) for URL categorization and this service is approaching to an end, as shown at the MRS web site below:
What this means to you? It means that in January 1st 2016 the URL Filtering capability in TMG will not work and also NIS (Network Inspection System) will no longer receive updates. If you postponed your TMG demotion from your environment, better hurry, the clock is ticking and if you rely on those services to keep your environment secure, better starting planning the replacement of those ASAP.
For more information about the TMG lifecycle visit https://aka.ms/mrs-roadmap