NOTE: This particular error is not related to Penelope Resources.
Users syncing their Penelope Events to their Outlook calendars may find that they have "The resource could not be found." listed in their error list, either on the System Admin side or in Worker error lists, and Revert Errors does not clear the error. This behaviour is expected.
This error can appear if
a Worker deletes an Event in Outlook that has been synced from Penelope
an Event has synced from Penelope to Outlook, and then the Worker changes the calendar that the Event is associated with in Outlook
Penelope is able to sync with Outlook only when there is a calendar named "Calendar". Penelope will sync with that calendar only and not calendars by any other name.