Just installed XP Pro upgrade today (from XP Home) and had to re-enter my POP3 email account data in Outlook 2003. For some reason, I can't now log in to the account. I get a server timeout and the ISP's server saying that it doesn't recognise my account details. I can still log on (using same username and password) on the webmail service, so there can't be anything wrong with the name or password.
I've tied all the obvious things, but am I missing something? Could the XP installation have some something to security settings somewhere down the line?