how do i get eOffice

do i have to be connected to their server to register from the phone? or can i just buy online and type in serial number?

i dont want to pay for it and then find i cant register it because i need to somehow be connected to their server

i am on pay as you go so i have no data connections

If you have no data connection you most likely won't be able to register from the phone. I would contact them first and find out how to register without a data plan.