Do not migrate from your Exiting Mail servers (either Lotus Notes or MS Exchange or Google Apps or some other paid service) to Zimbra at one shot. Let Zimbra Coexist with your existing paid solution with Same Domain for few accounts. Once you are completely satisfied with the performance of Zimbra solution and your confidence is build, take a decision to migrate. We work with you throughout this process to make it painless and smooth.
Was this answer helpful ? Yes / No
I am skeptical about the whole migration part from my stable Lotus Notes / Microsoft Exchange/ Google apps& others to Zimbra? What would you suggest?