So far this year, the buzz about Linux in enterprise networks has focused on servers and embedded systems, with the growth of Linux severs being most heralded. According to IDC, a research firm based in Framingham, Mass., Linux was the fastest-growing server operating system last year, with a 93% growth rate over the year before. Linux was the second most-shipped operating system in 1999 after Windows NT, capturing 24% of new licenses shipped.