Nokia Messaging is their push email system which resembles the one that comes with Blackberries. You can add your personal emails to the service and have them pushed to your handset. Nokia makes the service and does deals with the operators. In essence, operators pay Nokia and customers pay the operator. With this operators can offer these "value added services" and Nokia makes sure operators buy their handsets in the future too. With Saunalahti it doesn't require a data plan an comes at 5e/month.

Ovi mail is Nokia's "my first email" aimed at people in developing countries who likely have never had a computer(and e-mail) before. It is bundled with the cheapo S40 phones. Everything beginning from account creation can be done on the phone without ever requiring a real computer.