Using Mac OS X 10.9 (tried 10.7, too - same issue, then upgraded to 10.9). I need to connect Mac Mail or alternatively Mac Outlook 2011 to an Exchange 2010 server. (I tried Airmail, too - same issue.) The problem is, that all programs prompt for username and password and then refuse to accept the credentials. Also, when I try to access https://www.mydomain.com/ews/Exchange.asmx, Safari does not prompt for credentials - it just does nothing and shows a blank page. When I use Firefox on the Mac (or Chrome or IE on a Windows PC) to open that page, it prompts me just fine and the shows some xml data. Running https://testconnectivity.microsoft.com/
against the server (Sync, Notification Avalailability and Automatic Replies (OOF)) shows everything being ok. OWA works fine, too, but that's not too much of a surprise, as it uses form based authentication.
Any ideas on how can I get this to work?