A pragmatic perspective
Windows Live Sync is the new name of the service formerly known as FolderShare which lets you keep a pair of folders synced across multiple devices. Some have found the similarities between Live Sync and Live Mesh confusing since they both do similar things, so the best way to understand the difference is that Live Sync only keeps folders in sync, whereas Live Mesh does that and more – it offers an online desktop with free storage and lets you easily remote into your various devices. Still, Live Mesh is beta software and that’s not for everyone. Plus, FolderShare had many fans before Live Mesh was even available, so why not keep them happy?