If you are leveraging the OData feed to generate timesheet reports and dashboard, you will want to ensure to exclude from the Timesheet table, all entries with the Source identified as Outlook.

When the source of an entry is “Outlook”, it indicates that the record came from the Outlook or Google agenda retrieval and is still “unconfirmed” in the Timesheet Calendar (it appears in grey). As soon as the time entry is saved (with all the project information, role, user, etc.), it will be displayed in dark green in the timesheet Calendar as well as it will appear in the Hours list. That same entry will now have its source switch to Manual in OData.