Caldera Linux, also known as Caldera OpenLinux, was a Linux variant released by Caldera Systems (now known as the SCO Group) in 1997. Caldera OpenLinux was designed to cater primarily to the needs of businesses, focusing on enterprise-level productivity software. There were a few releases of Caldera, all of which were distinct in some way. "OpenLinux Lite" was free and available for anyone to download. "OpenLinux Base" and "OpenLinux Standard" were commercial versions offering extended features and technical support. These features included replacements for Microsoft Exchange Server and Microsoft Outlook.