Limited to 15 free licenses per company
Make Document Sharing Fast and Easy
2.
Install harmon.ie as per the instructions.
3.
When installation is complete, open harmon.ie in Microsoft Outlook.

Open Microsoft Outlook and access the harmon.ie sidebar.
4.
Open 'Add SharePoint Site' Dialog.

Click the + button in the SharePoint sites drop-down list to display the Add SharePoint Site dialog.
5.
Add your SharePoint site.

Add your SharePoint site URL and your credentials. Add as many sites as you'd like by repeating the process.
6.
You're ready to go!