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What is the difference between a Windows key and a CAL?

We have a windows small business network. The computers came with Vista, but someone installed XP on them and attached them to CALs on our SBS server. We purchased 15 CALs, but I can't find any invoices of someone purchasing any Win XP licenses. Does a CAL mean that you're licensed, or do you still need a license key and you're just allowed to access the server?

CrashDummy_MS

You need both. The CALs are Client Access Licenses, separate from the licenses and keys for XP or any other desktop OS.

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Jezbit

A windows key is the Operating System license for the machine that it is loaded on. A CAL al(Client Access License) allows named users / devices to connect to a server...

A Windows Server CAL is required when a user or device accesses or uses the Windows Server server software. However, if access is through the Internet and is anonymous (for example, when browsing a public Web site), a Windows Server CAL is not required. Also, if that user is an external user, another option is to acquire an External Connector license.

(If the PCs came with OEM licenses, downgradeable to XP, is it possible you may not have a separate invoice...)

sameeragayan

Windows Key - This key needs to install Windows XP / VIsta/ Server 2003 etc.. to your computer/server. Usually this key stick on outer cover of your computer. Or you can find it in installation disk pack.

Client Access Licenses (CALs) - required to access server services. (Required if you have a domain environment) Usually SBS server comes with 5 CALs.