The remote server returned an error: (403) Forbidden.

You get following message during syncing:

"Cannot connect to Google, please check for available internet connection and proxy settings if applicable: The remote server returned an error: (403) Forbidden."

We have upgraded to the Google Calendar API to Version 3! Please install 3.9.0 Version or later to use the new Calendar sync. If you don't need Calendar sync, you can also use the Version 3.8.5 without Calendar sync, but in April 2015 you should anyway Switch to a newer Version, because the new Version is already using oAuth 2.0 and older authentication Services will be deprecated soon and not work anymore.