Microsoft Exchange Server 2019 Standard, 1 User CAL
The Exchange server helps you get the most out of Microsoft Outlook. Mails, contacts, appointments, tasks, and more can be managed centrally via Exchange and made available to your employees. With Exchange, team collaboration is much easier, more efficient, and faster. To use Exchange, you must purchase client access licenses in addition to the software licenses for Outlook and the server itself. CALs are offered by Microsoft in two variants: so-called User CALs linked to individual user accounts and Device CALs linked to devices. You don't need additional CALs to use Exchange Online – licensing is covered by the Office 365 subscription or a separate license.