I am using windows live mail account last 2 years, suddenly my email accouont stopped working.
Select the Compatibility tab. Check the Run this program in compatibility mode for box and, from the drop-down menu, select Windows 7. Check the Run this program as an administrator box. Confirm changes and restart the Windows Live Mail client.
Go to C:\Users\username\AppData\Local\Microsoft and then right click on the Windows Live Mail folder and choose 'restore previous versions'. Then choose the most recent date to restore to and click restore. After restoring to a previous date, you can always restore back to a future date. Then open Windows Live Mail