What Is a CAL? User, Device and RDS CALs Explained

A Client Access License (CAL) gives a user or device the right to access a Windows Server. The server license alone is not enough for most businesses.

• User CAL — covers a person regardless of which device they use. Best when staff move between PCs.
• Device CAL — covers a machine regardless of who uses it. Best for shared workstations.

Remote Desktop Services (RDS) requires a special RDS CAL per user or device connecting over Remote Desktop. It’s sold separately from regular CALs.

• Windows Server Standard/Datacenter: yes, for each user or device.
• Windows Server Essentials: no — CALs are included.
• External (internet) access: usually needs special licensing — ask us.

Buying servers at scale? See our business licensing page or request a volume quote.