I have windows xp and for some reason suddenly I can't retrieve msn emails. I receive the error message mail host.host. Does anyone know how to fix this? Thanks.

Assuming that you are using MSN in "Microsoft Outlook" > Open the ".pst" file which you saved on hard disk drive ? Or perform send/receive action again. And if you are on slow internet line, it'll take a lot of time to retrive old mails resides in INBOX.