Last week, Microsoft released the latest version of their Sync Framework toolkit.

The official site relates:

"The Sync Framework Toolkit extends the Sync Framework capabilities for building offline applications, making it easier to expose data for synchronization to applications running on any client platform.  Sync Framework 2.1 required clients to be based on Windows. This toolkit allows other Microsoft platforms to be used for offline clients such as Silverlight, Windows Phone 7, and Windows Mobile; in addition non-Microsoft platforms such as iPhone, Android, and Blackberry can be utilized as well as HTML.

The Sync Framework Toolkit provides all the features enabled by the Sync Framework 4.0 October 2010 CTP. We are releasing the toolkit as source code samples on MSDN with the source code utilizing Sync Framework 2.1.  Source code provides the flexibility to customize or extend the capabilities we have provided to suit your specific requirements. The client-side source code in the package is released under the Apache 2.0 license and the server-side source code under the MS-LPL license."

You can download it from http://code.msdn.microsoft.com/Sync-Framework-Toolkit-4dc10f0e