The feature provides recruiters with the ability to check the availability of hiring manager(s) before sending out an interview invite. 

To enable Microsoft calendar, follow the steps provided below:

1. Navigate to the Settings > Administration > Organization > Configuration > Integrations.
2. Click on Edit.
Calendar Integration | Configuration

3. From the drop-down menu for Calendar Integration, choose the calendar preference as Microsoft.

This implies your Microsoft Calendar will be synced for scheduling interviews. 

4. Click on Save Changes to save the calendar preference.