I need to change the actual email system of my company.

I want to start testing Zimbra but don't want to take down our existing Exchange Server 2000, at least until the Zimbra is running without problems.

Can I configure a Zimbra server to deal only with emails for subdomain.mydomain.pt?

I'm new to zimbra and email servers to, so I appreciate any help that you can give me.

Here is my email in case of some of you decide to help me:
My preferred language is Portuguese.