User blorgon, with a HTC Radar, hard reset his device (removing all of the phone's data) before updating to the latest version of Windows Phone 7.8 through Zune. After the process was complete, he discovered that he could no longer sync his Google contacts or calendar when setting up a new Google account to sync. The checkboxes normally present in the settings for existing users have simply disappeared.

This is likely a by-product of the decision by Google to drop support for adding new Exchange ActiveSync-synced accounts after July 31st, with the company preferring you use IMAP, CardDAV and CalDAV for email, contacts and calendar syncing. Windows Phone used EAS to sync Google accounts, and Microsoft is working to support these different protocols in Windows Phone by the time EAS support is fully dropped.