When Microsoft launched Windows Live Sync in beta at the end of June, it merged it with its long-awaited Windows Live Mesh, but both still kept separate branding. The product will take on the Windows Live Mesh branding in the next couple of months. There are a few other changes coming too.
Right now Windows Live Sync, which is already being used by 240,000 people in beta, syncs files between PCs or between PCs and the cloud (mobile will be added later, but that is the ultimate vision). Syncing between PCs is unlimited, but syncing to the cloud up till now has been capped at 2 gigabytes per account. That will soon be increased to 5 gigabytes.