This feature applies to harmon.ie for Outlook, Enterprise Edition, only.
harmon.ie makes it easy to communicate with people, by email, chat, phone calls, and video calls:
The business cards shown in the People tab and the people information pane include icons to Send an instant message (), Call (), or Send an email message (). Click an icon to start communicating with this person. Learn more about finding people and about the business card.
Wherever a user name is displayed in harmon.ie (for example in the Locations tab in columns that refer to users, or the Version History dialog), it is displayed with presence awareness (Active, Away, Do Not Disturb, and so on). Right-clicking the presence awareness icon brings up an instant messaging context menu, which allows you to start communicating with this person by chat, voice or video call, and email.