The Windows Phone 7.5 version, which is also known as Mango, has a new rich user interface of Live Tiles and Hubs, which will help users to quickly find the information required and connect.
"With Windows Phone, we have looked at the consumer experience in an absolutely fresh way, and the end result is an innovative operating system which seamlessly integrates the most sought after user experiences like search, gaming, email and social networks," Microsoft India Chairman Bhaskar Pramanik said.
The conventional application icons have been replaced by Live Tiles, which keep showing real-time updates from the Web such as news, appointments or the status of friends.
Pramanik said a host of handset makers like HTC, Samsung, Acer and Nokia are expected to launch new devices based on the new operating system.
HTC is planning to launch its Radar smartphone based on the new Windows Phone 7.5 version which would be available next week, while Samsung Omnia would be launched next month.
The phone also comes pre-loaded with Xbox LIVE and Windows Phone Office.