EXCHANGE 2000 Alias Address

I’m new to the exchange world and was wondering how to create an alias email address. Currently our email addresses are the users login and the domain example jdoe@mywork.org. I still want the jdoe@mywork.org to work but would also like an alias to work for the same user like j@mywork.org. So the overall result is one user has 2 email address that go to the same mailbox.