outlook.live.com
Create calendar event (Outlook)
Input
end requiredEnd as local ISO, e.g. 2026-09-17T10:30:00.
start requiredStart as local ISO date-time in the mailbox's time zone, e.g. 2026-09-17T10:00:00.
subject requiredEvent title.
body optionalOptional event body text.
location optionalOptional location.
Output
end requiredstart requiredcreated requiredeventId requiredThe new event's id, as Outlook returned it when saving.
subject requiredverified requiredTrue when Outlook confirmed the save with the new event's id.
locationSet optionalrenderedWhen optionalThe composer's own rendering of the date range, as confirmation the ISO input was understood.
unverifiedReason optional