Has there been another as-yet-undisclosed breach at Yahoo?
With the recent release of iOS6, we have noticed a marked increase in support calls due to meetings having the owner of the meeting changed (sometimes called “meeting hijacking”).
Among Microsoft's recommended work arounds;
Block iOS 6 devices — Exchange server comes with the Allow/Block/Quarantine functionality that enables admins to block any device or user.
Tell users not to upgrade to iOS 6 or to downgrade their devices – This solution may work as a temporary fix until Apple provides a fix but many users may have already made the decision to update.
The Metropolitan Police Department (MPD) recognizes that members of the general public have a First Amendment right to video record, photograph, and/or audio record MPD members while MPD members are conducting official business or while acting in an official capacity in any public space, unless such recordings interfere with police activity.