More information:
http://blogs.office.com/b/microsoft-out ... -imap.aspx
What you need to know:
Incoming IMAP
Server: imap-mail.outlook.com
Server port: 993
Encryption: SSL
Outgoing SMTP
Server: smtp-mail.outlook.com
Server port: 587
Encryption: TLS
I've tested it and it is *very* slow, but it could just be the novelty factor as everyone tests it.