I was just pointed to the blog of David Loder who’s pointing out that the Release Candidate of Exchange 2010 is changing the permissions enforced by AdminSDHolder to critical groups to allow Exchange Organizational Admins to change the group memberships of Enterprise Admins, Schema Admins, Domain Admins a.s.o. OK, one of Microsoft Program Managers already responded, and I do agree that this is not a released product and pre-release versions are there for finding those bugs. I’d just like to say: