I have a client where Outlook has problems retrieving messages from a pop3 server. There were over 500 messages on the server; I don't know if that was pertinent or not. I cleared out the server mailbox by retrieving the messages into outlook on another machine, then copying the messages to the affected machine.
As part of troubleshooting, I archived messages, compacted the personal folders file, and ran scanpst. The file started out at 12 gigs, and is down to just over 4 now, still huge. Is the size pertinent?
After all the steps above, outlook was able to retrieve a couple of new messages last night, and the send/receive process looked like it ran ok. Today, it's hanging again.
Other items: plenty of disk space, clean temp folder. Norton Internet Security is running; when it's running, I can do a "telnet mailserver 110." When I disable any part of Norton, the telnet fails, as does outlook's receive. As much as I dislilke Norton, I don't think it's a major part of the problem.