Hi susan,
I'm not an expert, but from what I understand PUSH email means that when email arrives on your server, it will be "pushed" to your device. Instead of pulling it (when you click send/received) from outlook or similar.
I tried emoze before, and didnt really get anywhere since I didn't have a data plan (which what make push email useful) before.
I'm now using mail2web.com, and with a data plan, it works wonderfully with my Eten PDA phone. Everytime I received email on my server, it will pushed to my device in an instance (feels like it). If anything, I would suggest you try mail2web rather than emoze. Oh yeah, mail2web is free also.
Hope that helps.