OggSync for Outlook is a Microsoft Outlook add-in that syncs multiple Google calendars with multiple Outlooks. Users can manage their personal and professional calendars separately while keeping them consolidated with the power of Google Calendar.

OggSync for Outlook and OggSync for Mobile work together to give you a full view of your scheduled life. You can share information with others who need to see it while still keeping everything under one unified calendar. This makes it easy to stay on top of your schedule, no matter where you are.
The features in OggSync for Outlook Pro and Mobile Pro are impressive. You get full two-way sync, which is settable for each Google Calendar. There is also one-way sync, which can be set for each Google Calendar as well. Additionally, OggSync supports default calendar and multiple Google and Outlook calendars.
Other features include the ability to enter new events into any Google Calendar in OggSync Mobile, publish only free/busy info, always free option, do not publish private events, and no reminders option, all of which are settable for each Google Calendar. The software also supports XP and Vista and has an auto sync feature in both Outlook and Mobile.
If you're a subscriber, you can use both Outlook and Mobile versions of OggSync for the same subscription. All existing subscribers get Outlook support included in their subscription. There is also a freeware version available with more limited features.
The cost of a subscription is $29.95 per year, which breaks down to just $2.50 per month. This includes both Outlook and Mobile versions, making it an affordable option for anyone who wants to stay organized and synced across all their devices.
Version 3.19: Performance increases, better support for ToolBars.