Microsoft has announced their app developers to provide tools to integrate Windows Live apps iOS, Android and Windows Phone. Not only your Hotmail account will soon be reached easily from third-party apps, but also Messenger and SkyDrive.Are you planning to make an app, it is easy to access the contact list, photos and other personal information of Live accounts.
Third-party apps have authorization to access your Live account until you withdraw it manually again. To help developers, Microsoft sample code available. For example you can SkyDrive API sample download to start a simple project. The registration of your app from Microsoft ( via this page ) is a matter of name and insert language and accepting the conditions.