I typically use the well-done MSN Web Messenger at work to avoid firewall issues, and to avoid stomping on our company's branded version of messenger (which sucks BTW). When attempted this morning, I got the following message:
We can't sign any more people in right now. Please try signing in again later.
I wonder if it's just a web messenger problem or MSN messenger in general.
[UPDATE] Now I'm getting the ASP.NET "Server Too busy" exception, so I'm betting it's a web messenger only thing.