Here's a newspost that should help get you going in the right direction.
From the forums: How to completely switch from Gmail to Outlook | Windows Phone Central
And really, no one says you have to stop using all google services. From what I can tell, the big things are contacts, calendars, and push email. You can import your contacts and calendar easily, and just make sure important emails are directed to a different email acct, i guess. I could be wrong, but this is what I've gathered on the subject.