A little stumped here: We have a single Exchange 2010 server, UC certificate from Godaddy, and when we try to connect Snow Leopard Mail to a mailbox we constantly get prompted for username and password. However Entourage 2008 EWS edition on the same machine connects to the mailbox no problem.
We ran the EWS test at http://testexchangeconnectivity.com
against the Exchange mailbox and it passed.
The only error we see is when first adding the account, Mail throws the warning that 'the server at autodiscover.mydomain.com rejected the username and password. We have a public A record pointing autodiscover to our Exchange server.
In IIS - Autodiscover Authentication is set to enable Anonymous, Basic and Windows; SSL is set to require SSL and Ignore client certificates.
Any help greatly appreciated. Thanks in advance