Windows Live Mesh
Windows Live Mesh (formerly known as Windows Live FolderShare, Live Mesh, and Windows Live Sync) is a discontinued free-to-use Internet-based file synchronization application by Microsoft designed to allow files and folders between two or more computers to be in sync with each other on Windows (Vista and later) and Mac OS X (v. 10.5 Leopard and later, Intel processors only) computers or the Web via SkyDrive.