Outlook Calendar sync tool

[ViperGTI]

I'm looking for a tool that can sync two Outlook calendars automatically. Basically the person will have two calendars open on their Outlook: Their primary Outlook calendar and a second calendar which syncs with a mail server like Axigen or Smartermail. The users must do all their primary scheduling on the main Outlook calendar and that data should automatically sync to the secondary calendar which will in turn sync with the mail server so that users can see each other's availability. See image below:
http://www1.picturepush.com/photo/a/12015799/img/12015799.png

The reason for this is due to limitations on the secondary calendars. Smartermail's calendar does not allow scheduling and inviting people to appointments and the Axigen calendar does not show reminders.