Have you got Norton Antivirus? It's usually the cause of this problem and I've seen it happen millions of times, (I was in BTopenworld tech support) if so skip to part 2 - there's a couple of other things it could be though. First of all can you view webpages?? if you can't then skip to part 3.
1. Now the next thing is the connection you're using in OE - go into the account properties and click on the connection tab. Is there a tick in "always connect to this account using"? If there is, boot it out unless you're completelysure the Dial Up connection it's using is perfect. Also, on the servers tab, untick "my server requires authentication" if it's ticked. Try that and see if it works
2. If you do have Norton Antivirus you may need to uninstall, test Outlook Express and then reinstall if it's working.
Also Configure your firewall software (if any) to grant access to the Internet for the Msimn.exe file
"A. Can you get webpages? If so you may have the wrong mailserver typed in your account or the server may be down.
B. If you cannot get webpages hangup and try connecting again.
C. Reboot your computer and try again.
D. Still not working? Still not getting webpages? If so, treat as a normal "Not Moving Data" issue. (Check your DNS numbers, rip and reinstall TCP/IP, etc..)"