Shoutbox

First of all, I have to apologize for this late reply.
The session expiration is meant for Hotmail users. The current Windows Live Mail doesn't have that yet, not even Office Live Mail, if you are using it that's.
correct me if I'm wrong.
If you had done those stuffs, then I guess you have to clear your Internet Temporary File. It might be 'full'.
After cleaning it, try entering to your hotmail again by entering your e-mail and password on the log in page. Don't use the method of clicking on the Inbox icon on WindowsLive Messenger.
Try those steps mentioned, and report back if you encounter any problems.