Microsoft Corp., the world's largest software maker is ready to announce My Phone at the Mobile World Congress in Barcelona next week where it could announce more details about a test of the service.

My Phone is a mobile phone service that will harmonize address books, calendars and to-do lists in a bid to match Apple Inc.'s MobileMe. It also lets users back up their mobile-phone content on a website and share it online. Microsoft focused mainly on business customers with Windows Mobile.

My Phone is an application that will need to be downloaded(200MB) to the Windows Mobile device before users can create accounts which enables user to Access and update contacts and appointments on the web and Share photos with friends and family.

The Microsoft My Phone service will be free in which it challenges Apple MobileMe for $99 a year.