freakalad: "Instant mail retrieval", "dynamic mail" or even "instant mail"
You cannot use the term "push" when you're not acually delivering anything.
The Exchange Server is indeed 'pushing' the new emails/contacts/calender to 'your' mobile device, and
The Exchange Server is indeed 'pulling' the new emails/contacts/calender from 'your' mobile
So, whats the confusion now?