It's no secret cloud-based services are in abundance right now. As an MSP, there are certain services that you must have in your arsenal to offer to your clients.
There are multiple platforms to sell when it comes to cloud-based email with the most popular service still Exchange. Over the course of time, Exchange has morphed from being primarily an on-premise solution to a hosted cloud-based service. To take it even further, Microsoft has further developed its own hosted Exchange platform into what we now call Office 365. Another option is G Suite by Google with email just one of the included services. The platform you choose to perform the job may vary but, you must offer email services to your clients.