i need to add a second domain to my exchange server. i've read all the papers on how to do it, but wanted to know if (after i add the mx record on the relay, add the new domain in accepted domains, and create a email address policy, and apply that address policy in the shell), will i be able to set users up with access to both email domains in a single outlook instance, and will those users be able send emails from both @domain.com addresses?
When you add a second domain at your Exchange Server infraestructure, you must create a new DNS zone (includdind MX and A registers), and add a new Accepted Domain.
Outlook only allows one Exchange email account for each profile. If you want to display two email accounts in your Outlook, you need to create two Outlook profiles through the control panel of your computer.