Microsoft Exchange Server 2016 Standard 1 User CAL (Client Access License) is a license that allows a user to access and use the services of Microsoft Exchange Server 2016 Standard.
Exchange Server is a server platform for email, calendar, and collaboration used by many companies to manage internal and external communication.
The CAL license is required for each individual user accessing the Exchange server and provides access rights to specific server functions and features.
With the User CAL, a user can send emails, manage their calendar, share resources, and access other collaboration capabilities provided by Exchange Server 2016 Standard.
No product key is required. You will need to provide your company's license ID and associated authorization number.