As mentioned in my previous post, Google announced their decision to end support for Exchange ActiveSync (EAS). As a result, the updated Calendar app no longer has full sync support for Google Calendar events. However, there is still a way to get your events into the Calendar app. For customers that would like to, the Calendar app team has posted instructions on how to copy events from Google Calendar into your Outlook.com Calendar. Once you’ve completed the steps, you’ll be able to view and update all of these events in the Calendar app.
Alternatively, if you’d just like to use the Windows 8 app for receiving Google Calendar notifications (without the ability to add, delete, or update events) you can follow the instructions in this community support page.