Linux is the fastest growing operating system among 500 IT executives surveyed recently by Network World. The survey, completed in May, cut across a broad range of industries, from government, to manufacturing, finance, education, healthcare and military.\u00a0According to the report, 56.8% of the respondents said they had Linux running in their networks. Linux installations grew 8.8% this year compared to 2002, and the operating system was the fastest growing server operating system compared to Unix, Novell and Windows NT\/2000. (Linux is now more widely used than NetWare, the survey found.)\u00a0The percentage of Unix and Novell usage was flat this year compared to last, the report found. Meanwhile, Windows NT\/2000 usage grew slightly by 1%. (It couldn't get much higher, with 97% of respondents saying they used Windows NT\/2000). Unix was the second most popular OS, with 74% of enterprises having at least one Unix box. NetWare was present in 48% of networks. Around 4% said they were running other systems (you VMS, Apple and VINES-types know who you are).Linux also seemed to gain a foothold in the PDA world, as 5% of corporations said they were standardizing on Linux-based handheld computing devices. Windows CE\/PocketPC and Palm were the most popular handheld platforms companies are standardizing on. However, a quarter of respondents said they were not standardizing on any handheld.