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
Steve Novoselac's Blog 
2 replies on “Office 365 and Windows Live Messenger Not Working? Here's The Fix:”
I had this problem when I was in the Microsoft Office 365 trial period. The problem is that I’m not going to subscribe to this service (I was just giving it a shot) and now that the trial period has expired I’m not been able to log to my messenger account anymore. Do you think I will need to wait for more than 12 months? Is there any other thing that I could do to retrieve my account? I tried deleting it but now everytime I try to create it again I get a message that says something like “error… try again later”.
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I would just contact Office365 support and have them assist you
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