Dropbox is an easy to use freemium cloud storage solution. It has a client sync utility for multiple platforms. Developed by Dropbox Inc.
License: Freemium
Windows Live Mesh (formerly known as Windows Live FolderShare, Live Mesh, and Windows Live Sync) was a 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. Developed by Microsoft
License: Free Personal
Dropbox is primarily focused on file storage and collaboration with a user-friendly interface and extensive third-party integrations. In contrast, Windows Live - Sync offers deep integration with Microsoft products and real-time collaboration, making it ideal for users heavily invested in the Microsoft ecosystem.