Step 1

Go to https://outlook.office365.com/owa/?path=/options/manageapps
(you'll have to sign in with your Office 365 account)

Step 2

Click + (add) button and choose Add From a URL

Step 3

Enter URL

https://freebusy.io/outlook/officestore.xml

Step 4

Accept the warning and click Install

Step 5

When you compose or reply to an email in Outlook desktop and when you schedule or reschedule a meeting in Outlook desktop, you'll be able to open the FreeBusy add-in from the ribbon:

When you compose or reply to an email in Outlook desktop and when you schedule or reschedule a meeting in Outlook desktop, you'll be able to open the FreeBusy add-in from the ribbon:

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