This is the software publishers description:

gSyncit for Microsoft Outlook keeps Microsoft Outlook and your Google calendar in-sync. After installing gSyncit and starting Outlook you'll find a new toolbar available to configure gSyncit and synchronize your calendars. You can manually synchronize your calendar or have it automatically sync on a preset interval.

gSyncit works by updating your Microsoft Outlook calendar with your Google calendar entries and then updating your Google calendar with your Microsoft Outlook entries. All appointments that occurred in the past 365 days and those that will occur in the next 365 days will be synchronized. The latest version now supports read-only synchronization with additional public and private Google calendars.

Please note that Google, through their public API's, only supports two-way synchronization with default calendars. Secondary calendars and public calendars can only be updated into Outlook. Changes made to these appointments cannot be updated in the Google calendar using gSyncit.

System Requirements