Scheduling and managing events using Outlook.com calendar
I layed it out in detail in a post dated March 19 (it will be "Aceman57).
But I think the suggestion to use Outlook <> Google Calendar Sync mentioned above by Jeffrey Edison is a better option. You get a lot more control over what you want to sync.
I will point out however, that if you decide to use a different Gmail calendar rather than your main calendar the script is still a good idea to CREATE the calendar you want to use because it places it under "My Calendars" in Google. IOS device only display the calendars under My Calendars so if you wanted to be able to see that calendar on an IOS device you'd need to create that calendar with the script. After its created (i.e., you see the calendar under "My Calendars", you should then delete the script to stop it from syncing