Microsoft is aiming to add voice-recognition to popular software products such as Office 2007, following its estimated £400m acquisition of Tellme Networks in the US. 

Tellme already handles half of all US directory enquiry services and its voice-recognition software is used by many large companies for accessing automated services.

Microsoft has plans not only to get a foothold in growing mobile phone services market, but also wants to overhaul many of its computer software products with voice capabilities.

It would allow people to control many key features by voice, including being able to call up a Media Center PC and telling it what programme to tape without having to scroll through TV timetables. Voice-controlled GPS devices and phones have also been mentioned.

“Speech is universal, simple and holds incredible promise as a key interface for computing,” said Steve Ballmer, chief executive officer of Microsoft. “Tellme brings to Microsoft the talent, technology and proven experience in speech that will enable us to deliver a new wave of products and revolutionise human-computer interaction.”

Mike McCue, co-founder and CEO of Tellme, added: “Tellme was founded with the idea that anyone should be able to simply say what they want and get it from any device, starting with the phone. Now, with Microsoft, we'll be able to extend that vision to millions of businesses and consumers around the world.”

Microsoft will initially use the Tellme voice-enabled services alongside its unified communications portfolio, and will encourage third-parties to develop applications on the Tellme platform. It will also roll out new mobile directory services before adding voice features to Windows Vista, Office, Mobile and Automotive.