What is MATM in my User-agent

What is MATM in my User-agent

The most used IE User-agent's in my stats are:
Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; WOW64; Trident/6.0; MATM)
Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; WOW64; Trident/6.0)
What does the MATM stand for?