dear sir, thanks for your reply. i want to underastand what is the different between the run setup / with disasterrecovery & run the setup with this command setup/removeorg. when i am running the exchange server, i am preparing the forest by using the command of forest prep. so what is the relation between disasterreceovery & removeorg ? and when should i go to follow up with them , can you please expallin more . ? and how can i use the recovery storage group for that ?