Microsoft Windows 2003 Client Access License OEM (5 clients)

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Client Access Licensing

Microsoft offers flexible, cost-effective options for licensing the Windows Server 2003 family of products, including Windows Server 2003 R2 editions. Similar to previous Windows Server licensing models, one server license is required for each copy of the server software installed. In addition, a Windows Server 2003 Client Access License (CAL) is required for each user or device (or combination of both) that accesses or uses the server software. The same Windows Server 2003 Client Access License is used to access both Windows Server 2003 and Windows Server 2003 R2 servers.

Client Access Licensing Requirements

In previous Windows Server licensing models, Windows Client Access Licenses were automatically triggered when particular server services were invoked (such as file, print, remote access, and terminal services, as well as authenticated access).

With Windows Server 2003, CALs are no longer triggered based on the use of certain services but are instead based on access to and/or use of the server software. This holds true for all editions of Windows Server 2003 and Windows Server 2003 R2, except Web Edition. Windows CALs are not required for Web Edition.

Note the following general exception to Windows CAL requirements: Windows CALs are not required when access to the server software is unauthenticated and conducted through the Internet. Authenticated access is defined as an exchange of user or application credentials between the server software and a user or device. An example of this exception would be if unidentified users browsed your public Web site. Windows CALs would not be required for those users.

Device-based or User-based Windows Client Access Licenses

There are two types of Windows Client Access Licenses from which to choose: device-based or user-based, also known as Windows Device CALs or Windows User CALs. This means you can choose to acquire a Windows CAL for every device (used by any user) accessing your servers, or you can choose to acquire a Windows CAL for every named user accessing your servers (from any device).

The option to choose between the two types of Windows CALs offers you the flexibility to use the licensing that best suits the needs of your organization. For example:

	Windows Device CALs might make most economic and administrative sense for an organization with multiple users for one device, such as shift workers.
	Whereas, Windows User CALs might make most sense for an organization with many employees who need access to the corporate network from unknown devices (for example, when traveling) and/or an organization with employees who access the network via multiple devices.

Client Access Licensing Modes

After you have selected a license typeWindows Device CAL or Windows User CAL, you have the option to use the server software in two different modes: Per User/Per Device mode or Per Server mode. Both modes are available for either type of license.

Per User or Per Device Mode

Per User/Per Device mode is defined as follows:

	A separate Windows CAL (of either type) is required for each user or device that accesses or uses the server software on any of your servers.
	The number of Windows CALs required equals the number of users or devices accessing the server software.
	If you choose this licensing mode, your choice is permanent. You can, however, reassign a Windows CAL from one device to another device or from one user to another user, provided the reassignment is made either (a) permanently away from the one device or user or (b) temporarily to accommodate the use of the Windows CAL either by a loaner device, while a permanent device is out of service, or by a temporary worker, while a regular employee is absent.

Per User/Per Device mode tends to be the most economical designation for Windows CALs in distributed computing environments where multiple servers within an organization provide services across most devices or users.

Note that Per User/Per Device mode replaces Per Seat mode, used in previous licensing models.

Per Server Mode

Per Server mode is defined as follows:

	A separate Windows CAL (of either type) is required for each user or device that accesses or uses the server software on any of your servers. (This does not change the per server connection allowance of one CAL per one connection.)
	The number of Windows CALs required equals the maximum number of users or devices that may simultaneously access or use the server software installed on a particular server. The Windows CALs you acquire are designated for use exclusively with a particular server.
	If you choose this licensing mode, you have a one-time right to switch to the other licensing modePer User/Per Device mode. Your Windows CALs (of either type) would then be used in Per User/Per Device mode instead.

Per Server mode tends to be the most economical designation for Windows CALs in computing environments where a small number of servers have limited access requirements.

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