Entourage to Entourage 2004 onto Leopard?

I purchase a copy of Entourage designed for Mac OSX several years ago and I
love it. 

I don't like Thunderbird or the Mail app in OSX.

But now I bought a new Intel Mac running Leopard. Will the version of
Entourage that I have now run on the new Mac? It's version 10.1.4.

Do I have to purchase the upgrades that have happened to Entourage since I
bought it originally? Or just upgrade Entourage once it's on the new
computer?

What's the best way to get all of my mail and Entourage over to the new
Intel Imac?

Thanks