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GaryK - 5:10 pm on Aug 10, 2009 (gmt 0)
There are more recent versions, but this is the one I keep seeing: Mozilla/4.0 WebTV/2.6 (compatible; MSIE 4.0)
I maintain a project that keeps track of user agents. I still regularly see a few WebTV user agents visiting my sites. The most recent one was July 26, 2009.