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The debut weekend sales easily outpace those of its predecessor, Tiger, which took around two months to shift two million copies. The sales figures make Leopard the most successful OS release in Apple's history.

As well as boxed versions and upgrades, the sales figures took into account copies supplied through maintenance agreements and those bundled with new Macs.

Leopard

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is the sixth major release of Mac OS X and the company claims it contains around 300 new features, including the backup utility Time Machine and a redesigned desktop with added eye candy.

"Early indications are that Leopard will be a huge hit with customers," says Steve Jobs, Apple's CEO. "Leopard's innovative features are getting great reviews and making more people than ever think about switching to the Mac."

While Apple may be grinning from ear-to-ear, some of its customers have been slightly less positive about the new release following installation problems and the revelation that the operating system does not support the latest version of Java.