Ha! Now sorted - problem was, surprise surprise, Norton Internet Security.
Had to disable ALL email scanning features as Norton does not support SSL
scanning - quite why this was not an issue with Outlook 2003 I've no idea,
but following Norton's guide to disable all email scanning has solved the
issue.

"rmlindley" wrote:

I am having exactly the same problems. I am working with a university server
- worked fine before the beta version, can send but not receive emails.

Have tried with SSL connection, created new account, run diagnostics - no help

"Wayne Abruzzo" wrote:

The Outlook 2007 Beta 2 client is giving the 0x800CCC80 "None of the
authentication methods supported by this client are supported by your
server" error message when sending for an IMAP configuration running on
Windows Vista Beta 2. Is there an enhanced security setting I am missing
with the Outlook 2007 client or perhaps with Windows Vista that is
preventing messages from being sent?

ADDITIONAL INFO: Residential high speed Internet via Cox cable requires the
use of their SMTP server for all outgoing SMTP traffic so I use my incoming
IMAP server and Cox's outgoing SMTP server. I specify the appropriate
credentials for my incoming IMAP server and the appropriate credentials on
the Outgoing Server tab for the Cox SMTP server. I've Google'd the error
code and didn't get anything useful.

The identical configuration works perfectly under Windows XP / Outlook XP
(2002) and with Windows Vista / Windows Mail (default email client in
Vista). I've configured the email account slowly several times in Outlook
2007 to make sure I was not typing any of the info incorrectly. It seems to
be a security "feature" or other setting in Outlook 2007 or Windows Vista
that is preventing the connection/authentication. Or perhaps the Cox SMTP
server does not recognize commands coming from these Beta products.

Thanks for your input and suggestions.

Wayne