Install FreeBusy for Outlook add-in.
Start Outlook Desktop.
This tutorial uses Outlook Desktop.
If you’re using Outlook Web Access or Outlook.com, these steps are identical. You can find FreeBusy by clicking on Add-ins.
Linking Outlook add-in
Before you can use the add-in, you must link it to FreeBusy.
To do so, start a new email message. Click on Suggest Meeting Times as shown below.
The add-in pane will load on the right side. Click on the Sign in button.
You will be prompted to sign in with your calendar. Once this is complete, the add-in pane will reload.