What is a CAL?

A Client Access License (CAL) authorizes a user or device to access a Microsoft server product such as Windows Server, Exchange or SharePoint. The server itself needs its own server license; the CALs cover who connects to it. Without enough CALs, you are technically out of compliance even if every server license is paid for.

CALs come in two flavors. A User CAL follows a person across every device they use, which is the right choice for staff with a laptop, a phone, and a desktop. A Device CAL is tied to a specific machine and covers anyone who logs into it — better for shift workers who share kiosks or shop-floor PCs.

Still unsure?

Talk to a licensing specialist for a written, signed quote tailored to your environment.