I'm in the process of moving a client from internal Exchange 2007 to hosted Exchange 2007. However I have a requirement Where I have to move half the client's employees one week, and half the next week. In the meantime, they still need to be able to email each other.
Is it possible to create a transport rule so that when email is sent internally, it is also routed to the hosted Exchange server? What might that transport rule look like?
I have full admin access to both internal and hosted Exchange.