Depending on availability, you may receive this product as a Microsoft Open License. This license will come via email 1-3 business days after your order is placed.
Client Access Licensing
Microsoft offers flexible, cost-effective options for licensing the Windows Server 2003 family of products. 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.
Client Access Licensing Requirements
Client access licensing requirements have been updated for Windows Server 2003. In previous Windows Server licensing models, Windows CALs were automatically triggered when particular server services were invoked. With Windows Server 2003, CALs are no longer triggered but are instead based on access and use. In other words, Windows CALs are required when accessing or using the server software. This holds true for all editions of Windows Server 2003, 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.