We had Exchange 2007SP1 on Server 2003 with mailbox role (Exch1), and same configure with Hub and CAS role (Exch2).
I’m installing a new Exchange 2007 SP3 on 2008 R2 SP1 with mail box role (Exch3). Do I need to run setup /PrepareSchema or setup /PrepareAD? In what circumstances do I need to run those commands? Or just install Exchange? Will the new mailbox server use current Hub and CAS to send and receive emails? Thanks in advance.