Hard.com, the forest root domain, will not host exchange server.
soft.com domain and tor.soft.com domain will host exchange servers.
van.soft.com will not host any exchange server. However, van.soft.com domain will have mailbox-enabled users and mail-enabled groups.
Solution:
Forestprep --Hard.com
Domainprep --soft.com, van.soft.com, and tor.soft.com.
