Microsoft 6UA-03542 Windows SBS 2011 Standard CAL 1 Device

The Microsoft Windows Small Business Server 2011 Standard Client Access License (1 Device) is a licensing product rather than a piece of software. It grants one device — a PC, laptop, thin client, or other endpoint — the legal right to connect to and consume services from a Windows Small Business Server 2011 Standard environment. For organizations that rely on SBS 2011 for Active Directory, Exchange, SharePoint, and file services, each accessing device must hold a valid CAL to remain in compliance with Microsoft's volume licensing terms.

As a device CAL rather than a user CAL, this license is attached to the hardware itself. This model is cost-effective in environments where multiple employees share a single workstation, since one CAL covers the device regardless of who logs in. It is worth noting that Windows Small Business Server 2011 has reached the end of its support lifecycle, so this CAL is primarily relevant for organizations maintaining legacy infrastructure while planning a migration path to current Microsoft server and cloud offerings.