Office 365 (Outlook for Windows) - Error when attempting to delete an email message/calendar event

When attempting to delete a calendar event from a subscribed calendar you have editor permissions to, you receive one of the following errors:

Could not complete the deletion. The items may have been already deleted or moved. error

Outlook cannot delete this item error

Cause of this error:

You are on a Windows based computer which has a registry entry for “DelegateWastebasketStyle” - see Office 365 (Outlook for Windows/MacOS) - Sent or Deleted item is not saved within the sent/deleted items folder of the account actioned from article for more details. This registry entry is attempting to place the deleted item within the "Deleted Items" folder of the account you are deleting the event from - but you do not have the required permissions to this folder.


Important: The workarounds are listed from best to worst. If the solutions listed below are not clear or you need further information before making a decision, please contact the DoIT Help Desk.

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