How to integrate outlook 2013 calendar?
Have a look for the following modules:

Click to Schedule

It has sync capabilities for Outlook, Google calendar or iCal for Mac. Meetings are automatically confirmed, added to your Outlook, Google Calendar, or iCal and confirmation emails are sent to both parties.


CiviCRM activities iCalendar feed

Users can access an iCal feed of their upcoming (future) Activities, suitable for subscription via Google Calendar, Microsoft Outlook, and/or similar software.