[WM: Nothing in the post you have referenced indicates that the old master key won’t be revoked. Read it again. "[T]here are no current plans at Sangoma to deprecate the old master key. If circumstances in the future change, it would be done in such a way to minimize disruption." There also would appear to be a difference of opinion as to ownership of the old master key, but we’ll reserve comment on that for another day. And there have been reported issues. See, for example, this thread.]