As per the recent software bestseller list released by Amazon. com, the top two positions have been regained by the pre-orders for Apple's forthcoming Snow Leopard operating system - the Mac OS X 10.6; with Apple announcing the availability of the OS from August 28!

As the pre-orders kicked off at the Apple e-store and at other online resellers - while Amazon has been taking pre-orders since early August - the $29 Snow Leopard bagged the top place in the software sales chart, with the $49 Snow Leopard Family Pack ranking second.

Though the rankings of the Snow Leopard had slipped of late, with the $29 version often being in the third rank; the two packages had managed the top two positions within days of Amazon's announcement of the availability of the OS for pre-order.

In contrast to the Snow Leopard, the forthcoming Windows 7 operating system - to be launched on October 22 - was conspicuously missing from the top slots; with its best showing being the No. 31 slot, for the $119.99 Home Premium Upgrade. The highest-ranking Microsoft product was Office Home and Student 2007 at No. 3.

Meanwhile, with both the Microsoft Windows 7 and Apple Snow Leopard releasing within months of each other, there have been obvious comparisons between the operating systems, which reveal that the Apple OS is highly unlikely to threaten Windows 7 in terms of enterprise!