The Microsoft Exchange Server 2019 Standard User Client Access License (CAL) is a versatile license that allows a single user to access the core features of Exchange Server 2019. This license is particularly suitable for businesses that want to provide their employees with flexible use of email, calendar, and contacts across multiple devices.

Main features:

1. Comprehensive access: With the Standard User CAL, users have access to the core features of Exchange Server 2019, including email services, calendar functions, and contacts. This enables seamless communication and effective collaboration within the company.

2. Flexibility: The license allows a user to access the Exchange Server from various devices, whether from a desktop PC, laptop, or mobile device. This flexibility is especially beneficial for employees who are frequently on the move or who work from different workstations.

3. Cost efficiency: Compared to the Device CAL, which applies only to a specific device, the User CAL allows broader usage by a single user. This can lead to better cost efficiency, especially in businesses with many employees who use multiple devices.

4. Easy management: The Standard User CAL simplifies the centralized management of user access, relieving the IT department. This license supports compliance with licensing requirements and company policies.

5. Future-proofing: With the Standard User CAL, businesses benefit from the latest technology and improvements in Exchange Server 2019, helping them keep their communication and collaboration tools up to date.

The Microsoft Exchange Server 2019 Standard User CAL is an effective solution for businesses that want to enable their employees to access the core communication services of Exchange Server. This license supports efficiency, flexibility, and productivity in a modern work environment.