So I'm a home user, do you think if I paid for a month of Gapps, then cancelled, the plugin would keep working?If you've got Google Apps for Business then there is a plugin they do for Outlook, which imports all you Calendars, Contacts, Mail etc into Outlook. Pretty sure there's a way to do it manually if you're using normal Google Apps, the Outlook plugin works a treat though - I use it all day every day at work with no complaints.
https://tools.google.com/dlpage/gappssync