First you need to make sure your GMail account can use IMAP. Go into settings on GMail.
Next go to settings and click on Enable IMAP.
Or you can follow along here.....
Open Outlook and go to File - Info and the into Account Settings.
On the email accounts page you will choose NEW to set up the new IMAP account.....later if you have a POP3 setup, you can go back and remove it, once the new IMAP is working.
Then on the next page choose "Internet Email" and hit Next.
Then click on Manually configure and choose email.
Our imap and smtp server are imap.gmail.com & smtp.gmail.com
This should keep your Outlook and Gmail synced. This worked for me, but sometimes you gotta go in and change the port numbers in "more settings" - so test account and if it doesn't work go into advanced settings and set the port.
Here is what I have for our domain....
if what I wrote doesn't make sense you can refer to these two web sites I used to research the steps, or you might want to check it out if my steps don't work for you at Seabury: