August 16, 2012

Compatibity tool prompts for ADPREP when upgrading windows server from 2003 to 2008 R2 domain

Trying to upgrade windows 2003 domain controller ( single server ) I kept getting prompted to upgrade my AD :

Ended up that I had to :

  1. switch to native mode.
  2. run forestprep AND domainprep

After that, all was well. hope it saves someone some time.