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Authorize more users to access your Windows Server 2003! Now you have the choice of licensing users or devices. This client pack is licensed per user. This is a 20-pack of per-User Client Access Licenses (CALs) for Windows Server 2003 or earlier. A User client will cover a particular user's access to the server software from work PCs and laptops, as well as from home PCs, PDAs, Internet kiosks, and other devices. Per-User vs. per-Device: purchasing a Windows User client might make more sense if your company has a need for employees to have roaming access using multiple devices. Windows Device clients may make more sense if your company has multiple-shift workers who share devices. Note: Client Access Licenses must have the same or a later version number than the corresponding version number of the Server Software being used.