gSyncit
www.daveswebsite.com/software/gsync
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
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 you