Microsoft updated Live Mesh to work with Snow Leopard. There are no new features so Leopard users don’t have to do anything. I still use Live Mesh occasionally and it’s nice to have the updated client.
To upgrade to this new release, you will need to reinstall Live Mesh for Mac. To do so, please go to http://www.mesh.com, sign in with your Live ID, and download the Mac client software from the “Devices” page.