This article applies to:
In Microsoft Office 365, a delegate is granted permissions to a calendar in Microsoft Outlook. When the delegate tries to delete an calendar item, the following error message is displayed:
The item could not be deleted, it was either moved or already deleted, or access was denied.
When an calendar item is deleted, Outlook 2016 attempts to move it to the Deleted Items folder of the original mailbox.
If the delegate does not have permissions on the Deleted Items folder, the operation will fail.
Assign the delegate with at least Author permissions on the Deleted Items folder in Outlook.
In earlier versions of Outlook this was not an issue as deleted items were moved to the delegate mailbox.
This behavior is controlled via the DelegateWasteBasketStyle registry key which can be found under:
This key can have values of:
4 – move deleted items to the Deleted Items folder in the original mailbox.
8 – move deleted items to the Deleted Items folder in the delegate mailbox.
Outlook 2016 sets this key value to 4 by default.
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