We have two seperate installations of Exchange Server 2010. One is standard, and the other is enterpise. Both are configured the same in both domains (neither domain has anything to do with the other).
In Outlook Web Access when you go to Calendar (which shows up fine) and click new, the new calendar item (new Appointment) window appears, but doesn't fill with anything. Its just a blank IE window with a URL in the window bar.
Opening a new e-mail, or contact works fine, but neither the calendar or tasks seem to finish loading. Everything is enabled for everyone, and the problem happens for everyone, regardless of Windows OS.
Also, the drop down for the Username that shows up in the upper left hand corner doesn't drop down. When you click on it nothing happens. There are no issues with using Outlook 2010 against the server, for anyone, and the server does have a public SSL Certificate.
If I'm just forgetting to configure something, let me know.