As a tech the upgrade to E2E-1 or the latest E2E-2 is the best thing going. The programming is faster and easier. The New Emagen voicemail is all that and a bag of chips. As far as 6 to 7 to e2e 7 gave us Avanti single pair phones and e2e the IP phones. I just upgraded a customer from 7.36 to e2e2 with the new snapmail and it took 27 seconds to do the upgrade. And the new features are way beyond anything else I mess with.