Interesting news about Celestix, who makes a UAG appliance, saying that they will continue to deliver the WSA appliance until the year 2023. What I found interesting about that is that this goes past the 2020 deadline for TMG. But, I guess they will continue to leave in extended support the components of TMG that are required to keep UAG running.
For more information, check out TMG News at:
http://www.tmcnet.com/usubmit/2013/12/17/7598094.htm
HTH,
Deb