Microsoft is investigating user issues with the first update to its mobile operating system, Windows Phone 7.
According to the Windows Phone support Twitter account, users of the Samsung Omnia 7 and some other handsets have experienced problems trying to update handsets running Microsoft's Windows Phone 7 OS.
These include contact lists being reset, call history being deleted and profiles unpinned from the home screen. Other internet reports suggest Windows Phone mobile devices have been bricked when trying to update, requiring a hard reset.
In a statement released to Computer Weekly, Microsoft said: "Thanks for flagging this issue. We're looking into these reports."
Microsoft's Windows Phone 7 OS update was announced last week. In a blog post, Microsoft said: "This first update for Windows Phone is designed to improve the software update process itself. So while it might not sound exciting, it's still important because it's paving the way for all future goodie-filled updates to your phone, such as copy and paste or improved Marketplace search."
The update is available using either the Zune software for the PC or Windows Phone 7 connector for Mac.