I administer a Windows 2008 R2 Active Directory Domain.
All was good, all worked OK.
Came to install Exchange 2010 and found the missing “Document” functionality (but I don’t like to talk about this!).
Made a decision to implement UAG 2010 with SSO for OWA along side File Access and access to Remote Apps (RDS).
Followed recommended guides for setting up UAG with SSO but was always prompted for Username and Password when accessing OWA.