Use Outlook Web App to publish your calendar so that others outside of your organization can see when you are busy. Or use Outlook 2013 to send a snapshot of your calendar in email.
This video is part of a training course called Share or publish your Office 365 calendar. You can download the entire course or watch the videos online:
Need a reminder of what you learned? See the course summary.
Ready for another tutorial? See the complete list of Office 365 for business training courses.