(Bloomberg News) Microsoft Corp. unveiled its first new logo in 25 years as it prepares to introduce Windows 8, an updated version of its flagship software that will power the company's own Surface tablet and other touch-screen devices.

The logo uses the Segoe font, the same type used in products, and four colored squares that are "intended to express the company's diverse portfolio of products," the Redmond, Washington-based company said on its blog.

Microsoft, the world's largest software maker, is stepping up its assault on the tablet market as consumers increasingly choose the devices over laptops, weakening personal-computer sales and curbing Windows revenue. The company has said it plans to release Windows 8 in October and begin selling Surface later this year.

"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," Microsoft said on the blog.