Leading software supplier Microsoft on Friday sued Motorola, claiming the handset manufacturer’s Android-powered handsets infringed several patents held by it.

The software giant said the Droid X and Droid 2 handsets, along with many others, infringed nine of software patents that cover functions which are vital for the smart phone user experience such as scheduling meetings, synchronizing email, contacts and calendars.

Microsoft’s move is also an indirect legal attack on Google, whose Android smartphone operating system has been thriving by leaps and bounds since 2008.

Reacting over Microsoft’s move, Google said, “We are disappointed that Microsoft prefers to compete over old patents rather than new products. Sweeping software patent claims like these threaten innovation.”

Motorola said it would fight to the last to defend itself against the Microsoft’s claim.

Just a day earlier to the announcement of the lawsuit, Google declared that it was expanding the Android market to cover many more countries to allow more consumers to buy paid apps, while developers to sell apps.

Microsoft is not the first tech firm to sue a firm over Android. Oracle is also suing Google. Furthermore, there is no dearth of phone related suits. Apple is suing Nokia and HTC, and Nokia and HTC are suing Apple. Each firm is claiming that the other is exploited its intellectual rights.