CALs de Windows Server explicadas: User vs Device, CALs RDS y lo que necesitas de verdad
La parte más incomprendida de las licencias Microsoft — cuándo necesitas CALs, qué tipo y cuántas.
Buying a Windows Server license only licenses the server itself. Every user or device that accesses it — file shares, Active Directory, printing, applications — also needs a Client Access License (CAL). No CALs, no compliance.
User CAL vs Device CAL
| User CAL | Device CAL | |
|---|---|---|
| Covers | One person — unlimited devices | One device — unlimited users |
| Best when | Staff use multiple devices (PC + laptop + phone) | Shared machines — shifts, kiosks, warehouse PCs |
| Example | Office worker with PC and laptop → 1 CAL | 3 shifts sharing 10 PCs → 10 CALs |
You can mix them, but cannot convert one into the other. The rule of thumb: count whichever is smaller — employees or devices — and license that.
RDS CALs are separate
Remote Desktop Services has its own CAL type. A regular User/Device CAL does NOT cover RDP sessions into the server. Anyone connecting to a terminal server / RDS host needs an RDS User or Device CAL — and yes, that is on top of the base CAL.
- •File/AD/DNS/print access → base CAL
- •Remote Desktop sessions → base CAL + RDS CAL
- •External users (customers, contractors) → base CAL or External Connector license
- •The server OS managing itself → no CAL needed for admins (up to 2 admin RDP sessions are free)
Budget tip
For small shops, Device CALs often win — one reception PC serving 5 people needs 1 CAL instead of 5. For staff with phones and laptops, User CALs win. Count before you buy, not after an audit.
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