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Net Applications said that, "last month, Apple's Mac OS X accounted for 7.94 per cent of the operating systems powering computers that accessed the 40,000 Web sites monitors.

One year ago said Net Applications, "Mac OS X's usage share stood at 6.03 per cent".

According to Net Applications also showing gains in June "were Microsofts Windows Vista and Linux, which climbed 8 per cent and 18 per cent, accounting for 16.14 per cent and 0.88 per cent of the online operating system market respectively.

While Windows Vista's 256 per cent increase in market share over the last 12 months significantly outpaced Mac OS X's gains, Windows' overall June total was down 2.45 percentage points from the year before, indicating that Vista was replacing XP, not adding to Microsoft's overall OS share, said Net Applications.