Microsoft Security | Microsoft Graph
An API that connects multiple Microsoft services, enabling data access and automation across platforms
Graph API Calendar Delta Queries Not Reflecting Recent Deletions
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Andrey Matsukow
5
Reputation points
The issue started recently. When a recurring meeting is created in Outlook, the delta query request returns the added meeting. However, when the entire series is removed and another delta query call is made, no updates are received. Occasionally, updates appear for recurring events that were deleted some time ago, rather than the ones deleted recently.
Microsoft Security | Microsoft Graph
{count} vote
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Andrey Matsukow 5 Reputation points
2024-11-26T14:15:09.3866667+00:00 I think it might be related. When I create a recurring meeting I see a duplicate of the series for few seconds
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(38.4, 71%, 13%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EGB%3C/text%3E%3C/svg%3E)
Garrett Bjerkhoel 0 Reputation points2025-11-18T06:01:59.21+00:00 I've noticed this as well. Fetching the calendarView delta will return an empty array of events when the series master is deleted.
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