OggSync, once installed and registered, will keep your calendars in sync without you having to do a thing. Just set the frequency and go.
Download enables a fully functional trial with automatic calendar and contact sync.
OggSync bridges the gap between Google Calendar Contacts and Microsoft Outlook, Exchange and Office 365 Calendar Contacts. Your data can originate in either cloud and will be replicated to the other cloud.
OggSync has quite a few configurable items, including: Two Way Syncrhonization Sync repeating events including EXCEPTIONS Sync Multiple Calendars Sync unlimited number of events Sync Multi-day Events Sync All Day Events Sync Private Events Sync Alarm Reminders Sync to One Calendar View