http://blogs.msdn.com/livemesh/archive/2008/05/13/service-update-email-invitation-outage.aspxYesterday (May 12 th ) we experienced an email service outage from approximately 12:30pm to 8:00pm PST.  If you invited anyone to share a folder during this time, they likely did not receive the invitation email.  We don't yet have support foren-USCommunityServer 2.1 SP1 (Build: 61025.2)