Outlook Error 0x8004011d using RPC

I have an external user who gets his e-mails via Outlook using RPC.  It was working until last night.  He is using Outlook 2003 on Vista Business.  He gets an error every time 0x8004011d server not available.
He can get his e-mails on Outlook Web Access.
I've checked the hosts file, there's no reference to the mail server.
I've created a new profile (didn't want to delete the existing one in case I couldn't get his e-mails back.) but the same thing happened.
I tried stopping the Send Immeadiately when connected in Options and Mail setup and then connecting after Oultook was open (I found that on the Microsoft site) and it didn't work.
Can anybody help?  Thank you very much!
sirbubbaAsked:
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SembeeCommented:
What changed?
Things don't break like this for no reason, particularly if it was working before.
Are any other users using RPC over HTTPS? If so, do they work correctly?

Simon.
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sirbubbaAuthor Commented:
He's plugged into an ethernet cable at another location.  He can surf the net without any problems on that connection.
We've also tried turning off user access control.
RPC over HTTPS is working fine on my Windows XP laptop w/Outlook 2003
We are going to try his new cingular aircard later and see if Outlook works with that.
Thanks!
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sirbubbaAuthor Commented:
We tried the cingular aircard thinking there might be  a firewall causing the problem but the same thing happened when using the internet with the card.
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sirbubbaAuthor Commented:
I have a solution.  Install the certificate from the server into Trusted Root Certification Authorities on the laptop.  Outlook is working fine with RPC over https.
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