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Microsoft unveils new logo
Microsoft's new look.

Microsoft has unveiled a new corporate logo for the first time in 25 years as the US tech giant geared up for a series of big product launches.

The new logo features a square made up of four separate coloured squares. The old logo had a similar look but the squares appeared deformed as if part of a flag waving in the wind.

The move comes with Microsoft ramping up buzz for its Windows 8 operating platform and its first tablet computer, called Surface. The company is also making an aggressive effort to gain ground in the smartphone market.

"It's been 25 years since we've updated the Microsoft logo and now is the perfect time for a change," said Microsoft brand strategy manager Jeff Hansen.

"This is an incredibly exciting year for Microsoft as we prepare to release new versions of nearly all of our products. From Windows 8 to Windows Phone 8 to Xbox services to the next version of Office, you will see a common look and feel across these products providing a familiar and seamless experience on PCs, phones, tablets and TVs.

"This wave of new releases is not only a reimagining of our most popular products, but also represents a new era for Microsoft, so our logo should evolve to visually accentuate this new beginning.

"The symbol is important in a world of digital motion. The symbol's squares of colour are intended to express the company's diverse portfolio of products," Mr Hansen said. Microsoft is set to release its Windows 8 next-generation operating system tailored for a world shifting from personal computers to smartphones and tablets on October 26.

Finnish telecom giant Nokia and Microsoft are expected to unveil a smartphone equipped with the Windows Phone 8 operating system on September 5.