All Vista machine belongs to the WORKGROUP.
Make sure that TCP/IPv6 is selected.
Make sure that Windows Firewall allows the Windows Meeting Space traffic pass through.
If you create a meeting atLina Computer and Jane Computer, when you open the Windows Meeting Space from Kaiming Computer, you will see the two meetings shows.Make sure that Windows Firewall allows the Windows Meeting Space traffic pass through.
"Join a meeting near me" applies only to computers in the same network. For computers in different networks, you need to send an invitation.
Make sure that Distributed File Sytem Replication service is running.