To get started, you must first set up the connector to external calendar. Navigate to Admin Zone -> Main menu -> Global settings -> Connectors, API. There is a section Connectors to CRM systems and calendars, where you can connect your external calendar with CDESK. 

Click the drop down list next to Define a new connector label and select your calendar( MS Exchange and Google calendar options are currently available).

A new section for entering specific information about your external calendar will appear. Fill in your credentials and server information and click the Save button.

Setting up calendar connector

Image: Setting up calendar connector

Your CDESK calendar now should be synchronized with your external one.