Many IT professionals are turning to Mac and Linux systems to avoid installing Microsoft's Windows Vista operating system as an upgrade, according to a survey conducted by King Research. Of 961 IT professionals polled, a whopping 90 percent expressed concerns about migrating to Vista. What's more, over half of those surveyed said they had no plans to use Microsoft's latest operating system at this time. Macs are currently the most favored alternative to Windows with 28 percent of respondents saying they would most likely to turn to Macs, rather than upgrade to Vista.