You can use the email on any mail program (PC, Mac, phone, Blackberry, Windows Mobile, Android, etc) that supports IMAP mail accounts (pretty much all modern programs/devices do). It won't be push, but it will have the syncing of all your folders and whatnot with a fetch configuration (check server every minute, 5 minutes, 15 mins, etc). The calendar and contact syncing won't work on non-iPhone devices though.