Microsoft saw market fall in Sep for its share of operating system, while Apple gained due to users’ adoption of Snow Leopard. According to Net Applications, Microsoft’s share dipped from 93.06% in Aug to 92.77% in Sep, a dip of 0.31%. At the same time, Mac share rose from 4.87% to 5.12%, a gain of 5.13%. Since Nov 2008, Microsoft has consistently stayed in a market share range between 94.41 and 92.77%, with an incremental trend downward between those two points. Mac started in Nov 2008 with 4.12%, eventually trending upward over that 11-month period by exactly one percentage point. Windows 7 is due for general release on Oct. 22, occupied 1.52% of the overall operating system market. It originally broke the 1% barrier in Aug. At 71.51% Windows XP remains the most-used operating system in the world, followed by Windows Vista at 18.62%. Mac OS X 10.5 rounds out the top three with 3.03%. Some 18.45% of Mac users’ve upgraded to Snow Leopard, Apple’s new operating system upgrade released on Aug. 28.