Windows Server 2003 R2 Technical Overview
Asked: Is there an upgrade path from 2003 to 2003 rd?
Answered: Yes, supported upgrade paths for Windows OS’s can be found here http://www.microsoft.com/windowsserver2003/evaluation/whyupgrade/supportedpaths.mspx
Asked: Do all my servers have to be 2003 R2 for the new DFS to work?
Answered: To take advantage of all the enhancements yes, however 2k boxes can still work in this environment
Asked: If I upgrade from a W2K3 DFS, will the existing settings be saved?
Answered: I am farilry certian in the testing I did this you had to reconfigure it. take a look here for more info: http://technet2.microsoft.com/WindowsServer/en/library/14211e1f-2dbd-418d-b721-2005c725ce351033.mspx?mfr=true
Asked: as a developer, can I access the ADAM repository as well to facilitate SSO perhaps?
Answered: Active Directory Application Mode (ADAM): ADAM, an independent mode of Active Directory without infrastructure features, provides directory services for applications. Operating as a stand-alone data store or interacting with an Active Directory domain controller, ADAM's flexibility enables administrators to tailor their directory services infrastructure to varying degrees of local control/autonomy or shared services. ADAM provides a data store and services for accessing that data store, uses standard application programming interfaces (APIs) for accessing application data, and works with ADFS to provide a user store for extranet application authentication. http://www.microsoft.com/WindowsServer2003/R2/Identity_Management/default.mspx
Asked: Is there any documentation detailing the upgrade process from 2003 to 2003 r2?
Answer: Yes http://technet2.microsoft.com/windowsserver/en/r2.mspx