If your organization has scheduled an interview using the Outlook 365 integration, you can cancel/delete the the interview directly from Greenhouse Recruiting.
Navigate to a candidate profile with an interview that needs to be cancelled (All Jobs > Job > Candidates). From the candidate profile, navigate to the Stage tab on the On Job panel and expand the stage that requires a cancelled interview.
Click Update next to the scheduled interview.
From the Scheduling for candidate page, click Delete Interview in the bottom-left corner.
The interview is deleted, and the scorecard is removed from the interviewer's My Dashboard page in Greenhouse Recruiting. The interviewer(s) will be notified by email only if your organization has configured calendars to send email notifications for cancelled events.
Note: Be sure to send a notification to the candidate if needed; Greenhouse Recruiting does not notify the candidate of changes to the event.