The latest update of the Apple Mac operating system OS X, known as Snow Leopard, went on sale on Friday.
The software - available only as a DVD, not a download - was originally due to hit shops in September but Apple brought it forward at the last minute.
The system will go head-to-head with Microsoft's latest operating system, Windows 7, due for release in October.
Both will also compete with a system from Google, called Chrome OS, set for release in the second half of 2010.
Google will offer an entirely new operating system, whilst Windows 7 and Snow Leopard are refinements to existing systems. - BBC News
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