Calendar app deleted google calendar events

[Joanna Lin]

I have synced google calendar to outlook calendar since windows 8. It worked very well. I can add events to google shared calendar from my windows phone and friends' calendar all updated. After upgrade to windows 10, I noticed that all my google calendar events before November 1 has been deleted. They don't show on surface calendar app, not on online outlook calendar and not in my windows phone calendar any more. All future events are still there. But because all holidays are from google calendar, I can't check what date was 2015 thanksgiving!

All events are still in my google calendar in gmail of course, but how can I sync them back and stop your app from deleting them in the future? My calendar setting is already "never delete" after completing an event.

Thanks,