I understand that one way to be able to run 16bit applications on 2008 server is to actually install 2003 server and use it via Terminal Services. My question is how to obtain a copy/licences for 2003 server as it no longer appears to be generally available?

Hi, You can purchase Windows Server 2008 R2 license/media and downgrade to Windows Server 2003 R2 as you wanted. Windows Server 2008 R2 downgrade Terms and Conditions http://www.microsoft.com/windowsserver2008/en/us/downgrade-TC.aspx For details, please call 1-800-426-9400 (select option 4), Monday through Friday, 6:00 A.M. to 5:30 P.M. (PST) to speak directly to a Microsoft licensing specialist. Worldwide customers can use the Guide to Worldwide Microsoft Licensing Sites http://www.microsoft.com/licensing/index/worldwide.asp to find contact information in their locations.