Windows Mail stops sending and receiving mail after working fine. All of the settings are the same and I double checked the incoming and outgoing server names. An error code 0x800c0148 is returned. I tried searching the Microsoft Knowledge Base but no matches are found for this error code. Anybody know what it means?

There is a discussion about that error in Vista in the link below.

http://www.vista64.net/forums/vista-mail/4...-all-fails.html

Please note the "port 0" part of the above post - if your Windows Mail is saying this, then it's likely that either your settings are messed up, or another program is messing with them.