Access Licenses, also known as Client Access Licenses (CALs), are necessary for users or devices to legally access server software. They come in two main types: User CALs, which permit a single user to access the server from multiple devices, and Device CALs, which allow multiple users to access the server from a single device. CALs ensure compliance with Microsoft's licensing requirements, providing flexibility for businesses to optimize their licensing based on specific needs and usage patterns.
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