Google Calendar Sync allows you to sync events between Google Calendar and Microsoft Outlook Calendar. You'll be able to determine the direction of information flow, as well as the sync frequency. Staying on top of your Google Calendar and Microsoft Outlook Calendar events has never been easier! Here's some good information to know to help you get started with Google Calendar Sync.
Currently, Google Calendar Sync is only compatible with Microsoft Outlook versions 2003 and 2007, and operating systems Windows XP and Windows Vista.Windows XP 64-bit Edition is not compatible with Google Calendar Sync at this time
We understand that many people like to stay connected with various calendar applications. Unfortunately, it's not recommended to use Google Calendar Sync when using third-party sync applications* that sync between Microsoft Outlook and Google Calendar. Please be aware that doing so may result in duplicated events or deleted data.
[*Spanning Sync and Busy Sync users beware]