Sync Google and Outlook calendars?

It seems this is no longer possible since Apple removed features from the OS when "upgrading" to Mountain Lion and since google removed their own syncing tool for exchange in January 2013. This leaves an opportunity for a 3rd party developer to fill this gap... but I stil have found nobody who came out with a solution. Why not a server based solution without the need to install software ?

With syncing, you need to understand that when an event is created in a google calendar, then the same event is created in the exchange calendar.When an event is created (or deleted ) in exchage (office 365), the same event occurs in the google calendar.

Why would I need this ? For example: tools like scheduleonce.com only work with a google calendar, and my company calendar is based on exchange.