Microsoft Exchange Client Access License (CAL)

Exchange Server 2016 lets you accomplish more with rich Outlook experiences on phones, tablets, desktop, and the Web. Integration with Outlook, SharePoint, and OneDrive for Business helps you experience collaboration better when receiving, editing, and sharing documents without ever having to leave Outlook. New search capabilities deliver faster performance and more accurate results. Inbox enhancements in Outlook 2016 and Outlook on the web, such as inline previews for URLs and inline video, help you stay focused and productive. A simplified architecture brings new levels of reliability with automated repair and faster recovery. Expanded data loss prevention, easier auditing, and faster and more reliable eDiscovery help your organization comply with legal requirements.

- Standard: designed for the mailbox needs of small to midsize organizations. Also appropriate for non-mailbox roles in a larger Exchange deployment. This edition supports 1 to 5 mailbox databases.
- Enterprise: designed for larger organizations that may require a greater number of mailbox databases. This edition supports 1 to 100 mailbox databases.