Earlier this summer, I moved from Google Apps to Office 365. I really don’t use Windows Live Messenger for personal IM, but log in every once in a while, also Xbox 360 can login. I noticed on live.com when I hit it, the web messenger continually tried to login. Also my Xbox and WLM on my PC wouldn’t login (error code 8100037b). What gives?
Well, I figured it might have had something to do with Office 365 and Lync Online, and I was right. I had to go into Office 365, Admin, under Lync, General Settings, and disable external communication settings. After 12+ hours I could then log into Windows Live Messenger. Kind of a mess if your org might be using Windows Live for IM and then moving to Office 365. Of course your Lync could federate out to WLM, but still, not being able to log in could be a pain