After a complicated series of transfers, SCO held rights to a version of the Unix operating system originally developed by AT&T. That software now is part of Caldera's product line as part of a strategy to sell software that covers everything from low-end servers running Linux to high-end servers with Unix. Caldera also has a much stronger support organization.
But Caldera faces steep competition from Red Hat, which managed to raise money in two public offerings when the Linux hype was more lucrative. Caldera squeezed in its initial public offering in March, shortly before investors started to lose interest in Linux.
Under Caldera's plan, software won't have to be changed at all to run either on Linux or Unix servers. The company's new tagline, "Unifying Unix with Linux for business," reflects the vision.
SCO will rename itself Tarentella after its remaining product, used for running software on central servers that desktop computers or dumbed-down "thin client" computers can tap into. SCO will change its stock ticker to "TTLA" on Tuesday, the company said.
The merger, planned since August but delayed in February, takes place amid a Linux market afflicted by difficult times. But while Caldera managed to complete its acquisition, two others last week fell through.
SCO initially derided Linux as immature, but the Unix clone nevertheless encroached on the company's Unix products at the same time that much of the Unix spending was being lavished on Sun Microsystems and other Unix server companies.
IBM announced a partnership called "Monterey" to merge SCO's UnixWare software with IBM's AIX version of Unix. That product now has been released as AIX 5L, which runs on both Intel servers and IBM's Power chip servers, but much of IBM's attention now is focused on Linux.