Google Calendar Sync now supports Outlook 2010 — our top feature request. Outlook 2010 comes in 32-bit and 64-bit versions, and currently only 32-bit is supported. To start syncing your calendar with Outlook 2010, download Google Calendar Sync version 0.9.3.6. Once you install it, a Settings window will appear. Enter your account’s email address and password, choose your sync option and sync frequency, and you’re done! (Note: If you’re already using Google Calendar Sync, you’ll still need to download and install this new version in order to be able to sync with Outlook 2010.
Google Calendar Sync now supports Outlook 2010 [Official Gmail Blog]