If you are facing sign in problems when using Windows Live Messenger or not able to login because of any error, Microsoft solution center provides you with simple tips to solve this. This issue could be because of the corrupted cache of Windows Live Messenger. Users are presented with the message when they sign in: “Signing into Windows Live Messenger Beta failed because the service is temporarily unavailable. Please try again later. Error Code: 80010100.”
You may not be able to Sign in to Windows Live Messenger, due to any of the following reasons
1. Contacts cache in Windows Live Messenger is corrupted
2. Incorrect Date and Time settings in your computer
3. Firewall is blocking Windows Live Messenger Service
Microsoft solution center has provided help on how to solve these issues by deleting the application cache.
More details on how to solve this issue can be found here.
