Outlook 2003, Win 7 x64, Gmail. Outgoing fails. Incoming OK

Buggy problem that I cannot find any clues about.
I've setup this exact sort of thing before with no issues.
This account is using Centurytel as their DSL ISP, with a new dell system running windows 7 Pro x64, and a fresh intstall of MSO 2003.
Setup Outlook 2003 per the gmail instructions: imap for incoming, smtp for outgoing, set the server ports, ssl etc all correct, double checked, triple checked.

no outgoing mail has ever completed [its been a week now]. All incoming mail is fine. Outgoing mail fails whether its a "reply" or a newly-created message of any length, regardless of attachments or not. they land in the outbox, cannot send.
tried turning off the AV... no effect.

is there a firewall setting in Win7 Pro that could be affecting outgoing?

is it possible that we could limp along by changing the outgoing server to a centurytel server? that has some admin ramifications I realize, but might it work?

Did you setup gmail. According to These Instructions you have to also enable IMAP in gmail.

yep. as covered in my OP

well, it started working.... don't know why. :sarc:
the only thing "different" was getting her to use a browser to login to gmail, check mail, settings, etc, then out. .....
went back to outlook, hit the "send receive" button and the outbox emptied a week's worth of constipation