Tested guide for upgrade 2003 domain to 2012
Raise domain/forest functional level to 2003 Domain is raised from AD users and computers Forest is raised from AD Domains and Trusts Prepare AD for 2012 The command adprep is located on your Server 2012 disk under the \support\adprep Run in cmd adprep /forestprep If KB919151 is not installed adprep /forestprep will fail with “ADPREP.EXE is valid, but is for a machine type other than the current machine” – REMARK addprep.exe must be copied from x86(or x64) folder to the folder where all other files (sch1, sch2, and so on, schema.ini is also inside), then run it from there. Install 2012R2 server, join it to the domain and promote it as DC First add active… Read More »Tested guide for upgrade 2003 domain to 2012