When you open the recurring meetings, it should tell you who the organizer was. If it shows the organizer to be the exec who has not left yet, he will have the option to send out cancellations. If he simply deletes instead of sending the cancellation he may need to recover them from his deleted items first. If the organizer was the person who left some time ago you could do a restore of that account, give someone full control of the restored mailbox and have them send out the cancellations from that mailbox. If that is not a possibility, then simply send an email to the invitees instructing them to delete the appointments from their claendars themselves. They CAN delete them, it just won’t send out cancellations to any of the other invitees of course. I just successfully deleted a series of recurring test meetings of which I was not the originator just to be sure it can be done. Have the appropriate person send out new invites.