The 5 possible Exchange 2007 server roles are:

Unified Messaging
Edge Transport
Client Access
Mailbox
Hub Transport

For an indepth look at these roles, click one of the Exchange 2007 roles above.

Continue reading " What are the 5 Exchange 2007 server roles "

The Exchange 2007 Hub Transport role is:

Responsible for internal mail flow
Installed in Active Directory
Varies if you are using an edge transport server as well.

Continue reading " Exchange 2007 hub transport role "