I don't know what you did or are trying to do, but if you are using Live Mesh and wish to share a folder with people, you need to share it with specific people. There is no public sharing from Live Mesh. Users are individually invited.
In order to use Live Mesh, people need to have a Live Mesh account from www.mesh.com
Correct me if I misunderstood and I'll remove the answer atttribute from this post.
-steve
Microsoft MVP Windows Live / Windows Live OneCare & Live Mesh Forum Moderator