In my existing test environment i need to do the following :-
Create a second domain and link it with an existing domain i.e. Test.com
Test.com (already exists)
Test1.com (needs to be created as new domain, existing forest)
Overall goal: after creating test1.com, I want to link test1.com user mailboxes with existing Test.com user mailboxes to allow Test.com users to receive email sent to "their.username@Test1.com" within their existing "Test.com" Exchange-based mailboxes.
Note:- For the above test do i need to create a new exchange on the new domain. If yes then should i give different ip ranges for the new domain & the Exchange server . I am in a learning stage now .