Iâm often asked how to change the organizer or remove meetings created by a user who is no longer with the company. Some meetings need to be kept, but will be managed by a different person, other meetings need to be deleted.
While changing the organizer is still a pipe-dream, administrators can now cancel all meetings using the Remove-CalendarEvents cmdlet. This cmdlet will remove the meeting from the calendars of meeting resources and attendees.
To cancel all future meetings as of Today, the syntax is
Remove-CalendarEvents -Identity alias@domain.com -CancelOrganizedMeetings
To cancel meeting within a date range, such as for someone who took a sudden leave of absence, youâd use the following cmdlet.
Remove-CalendarEvents -Identity alias@domain.com -CancelOrganizedMeetings -QueryStartDate 8-1-2017 -QueryWindowInDays 90
More Information
Remove-CalendarEvents (TechNet)
How to delete Calendar entries in default Calendar in OWA? My issue is that Calendar and Contacts are messed up due to reasons beyond one's imagination. I was able to save most of the Contacts and lost Appx 500 very important ones. Later I deleted all contacts from OWA to clean orphan Contacts in OWA and reloaded via Desktop Outlook. But I cannot delete all entries at single shot from OWA Calendar to remove Orphan entries Is there any way to delete all Calendar entries in one shot from OWA?