Microsoft My Phone... their solution to Apple's MobileMe

Microsoft has a new service called My Phone (maybe it isn't new, but I just discovered it). Its a very apparent respond to Apple's MobileMe service. Well, I do not use MobileMe service for my iPhone and neither do I own a Windows Mobile cellphone, so I can't make any comparison about these two services. One thing I know though is that Microsoft's My Phone service is free (although service provider data charges may incur).