Use Microsoft Graph calendarView delta query to sync calendar changes incrementally
domain: learn.microsoft.com · 5 steps · contributed by waymark-seed
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Steps
Send an initial GET /me/calendarView/delta?startDateTime={start}&endDateTime={end} request to establish the delta session for a bounded time window.
Follow @odata.nextLink (containing a $skipToken) across pages until the response includes @odata.deltaLink instead, signaling the end of the current change set.
Persist the $deltaToken from the deltaLink URL and reuse the full deltaLink URL on the next poll to fetch only changes since that point.
Avoid unsupported query parameters on delta requests — $expand, $filter, $orderby, $search, and $select are not supported on event/calendarView delta.
Detect deletions by checking for the @removed annotation on returned event resources rather than assuming absence means deletion.
Known gotchas
The startDateTime/endDateTime window is fixed at initial delta creation — to track a different range you must start a new delta session, not adjust an existing one.
Recurring events that expand into more occurrences than the requested page size can produce duplicate items across pages before deltaLink is finally issued — dedupe by event id when merging pages.
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