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Migrate from One Windows Version to Another
Windows Easy Transfer
Migrate from Windows 2003 Server to Windows 2008 R2 Server
In a nutshell
Run dcdiag and netdiag from the command prompt on the old machine to check for errors. If you have some, solve them first. For these tools you have to install the support\tools\suptools.msi from the 2003 installation disk.
Prepare the current Active Directory forest to accept a Server 2008 R2 DC. You do this by running
Adprep.exe /forestPrep (Adprep32.exe /forestPrep on x86 server)
on the current DC. Adprep is found on the Server 2008 R2 installation DVD in the Support\adprep folder. Some Antivirus software can sometimes interfere with this command. You may want to temporarily disable the antivirus service from running on the Schema Master until the process has been completed.
http://technet.microsoft.com/en-us/library/cc731728%28WS.10%29.aspx
The next step is to run Adprep.exe in each domain, while logged on to the domain controller holding the Operations Master FSMO role. This command is only run on that server. You do not run this command on each domain controller. You must be logged into that server as a Domain Admin. One of these two commands should be run.
Adprep.exe /domainPrep Adprep.exe /domainPrep /gpPrep
If you already ran the /gpPrep parameter for Windows Server 2003, you do not need to run it again for Windows Server 2008 or Windows Server 2008 R2. This command adds only the inheritable access control entries (ACEs) on Group Policy objects (GPOs) in the SYSVOL shared folder. The additional ACEs give enterprise domain controllers read access permissions on GPOs. These permissions are required to support Resultant Set of Policy (RSOP) functionality for site-based policy.
