Groupwise Mobile from Novell is in version 2 now. It needs a server side setup (i.e. your employer needs to set it up). After that you will need a password (like you use at work) to log on.
An alternative for push mail with Groupwise (if you have IMAP access to your account) is either
Emoze
http://www.emoze.com/en/get/index.asp
or
Consilient (beta)
http://pushreg.consilient.com/
I setup Consilient and it worked well. Some issues with email dates were noted.