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Client access licenses (CALs)

90. What is a client access license (CAL)?

A client access license (CAL) is a license granting access to certain Microsoft server software. CALs are used in

conjunction with Microsoft server software licenses to allow users and devices to access and utilize the services of

that server software. For instance, a company looking to use Windows Server would acquire a Windows Server

license in order to install and run the Windows Server software on the physical server itself. In order to provide the

rights for users or devices to access the Windows Server software running on the server, CALs would need to be

acquired for those users or devices.

91. What are the different types of CALs?

There are two types of CALs:

• Device CALs—Acquire an access license for every device (used by any user) accessing your servers. Device CALS

make the most economical and administrative sense for an organization that has multiple users for one device,

such as shift workers.

• User CALs—Acquire an access license for every named user accessing your servers (from any device). User CALs

make the most economical and administrative sense for an organization with many roaming employees who

need access to the corporate network from unknown devices, and/or employees who access the network via

multiple devices—that is, if the number of users is less than the number of devices, then this is the more

economical choice.

For Terminal Services CALs or Remote Desktop Services CALs differences, see question 109.

92. Can I use my Windows Server 2008 CALs to access Windows Server 2008 R2?

Yes. As a matter of fact, that is the correct product to use because there are no new Windows Server CALs, only new

RDS CALs. Purchase RDS CALs for Terminal Services access. The Windows Server 2008 Terminal Services CALs

(TS-CALs) will work on Windows Server 2008 R2.

93. If a user or device accesses a server running Windows Server 2008 but is authenticating via a third-party

authentication application (non-Microsoft based authentication), does the user or device still require a

Windows Server 2008 CAL?

Yes. If the user or device is authenticating by any means to a server running Windows Server 2008, a Windows

Server 2008 CAL is needed.

94. Can I use a Windows device CAL and a Windows user CAL to access the same server? Also, can I use a Terminal

Services device CAL and a Terminal Services user CAL on the same terminal server?

Yes. Windows device and user CALs, as well as Terminal Services device and user CALs, can be used on the

same server.

95. I have some extra Windows Server 2003 CALs that are not being used. Can I apply these to servers running

Windows Server 2008 R2?

No. CALs must be the same version as—or higher than—the server software they are accessing. In other words,

users or devices accessing a server running Windows Server 2008 R2 must have Windows Server 2008 CALs.

96. If I move an instance of Windows Server 2003 to run as a virtual instance on a server with Windows Server 2008

R2 Enterprise Edition running in the physical operating system environment, can I use Windows Server 2003

CALs to access the virtual instance of Windows Server 2003?

No. Because the virtual instance of Windows Server 2003 runs on a Windows Server 2008 R2 license, the user or

device accessing the virtual instance of Windows Server 2003 needs a Windows Server 2008 CAL.

97. Can I use a Windows Server 2008 user CAL to access a server running Windows Server 2003?

Yes. Both Windows Server 2008 user and device CALs can be used to access instances of Windows Server 2003.

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