For Push-Email try Zarafa with z-push. It works on SME and works fantastic with Nokia MFE (Mail For Exchange). It can Sync Mail, Phonebook, Calender. Is is compatible with all Active Sync Devices, like Iphone, BlackBerry.
Z-Push is an implementation of the ActiveSync protocol which is used 'over-the-air' for multi platform ActiveSync devices, including Windows Mobile, iPhone, Sony Ericsson and Nokia mobile devices. With Z-Push any groupware can be connected and synced with these devices.