The Dev Lead responsible for MSN Messenger connectivity sent me this very cool link. If you’re getting an 80072f19 error when you try to connect to MSN Messenger, check out this site. Here’s the best bit.
This worked for me:
Start IE & select Menu – Tools – Internet Options – Advanced
Under Security Section – Clear the "Check for server certificate revocation (requires restart)” check box
Start MSN Messenger beta 7 again & you’ll have to issue your passport account information again. You’ll receive one more error. Login again and it will work.