I was invited, and I installed it. When activated, however, all you see is the signature circle rotating, and the text "Loading. Please wait ...". This has been going on while I've been typing this, or about 5 minutes. I had installed it earlier but it seemed to crash my Xbone, so I uninstalled it. I guess I'll uninstall it again. Useless, and without clear and more substantive information, a compete waste of time.