I signed up, I guess on an individual basis.....didn't start a group yet.....It's not too bad, just a few things that we'll have to learn, IF we go there, but it has some things better than MSN...and some not so good.
MSN will announce when they are ready to start the migration. At that time you will get a list of groups that YOU are the manager of. Only the Manager can migrate a group. Once you have migrated to the new home, you can then assign your assistant Managers or Administrators as they call them. When the migration begins and you move your group ... ALL of your group will be shifted to the new site all at once.