Microsoft Exchange Server 2016 Enterprise - license - 1 server

Microsoft Exchange Server 2016 brings a new set of technologies, features, and services to Exchange Server. Its goal is to support people and organizations as their work habits evolve from a communication focus to a collaboration focus. At the same time, Exchange 2016 helps lower the total cost of ownership whether you deploy Exchange 2016 on-premises or provision your mailboxes in the cloud.