Microsoft Outlook can use Add-ins (also called plug-ins) that add features to the email client.
Some of them might be there without you even knowing it.
While others may be needed to enhance the software.
Learn how to enable or disable Outlook add-ins with these steps.
FAQ
Why are my buttons grayed out on the COM Add-ins screen?
In Outlook for Windows, check under File > Office Account > Manage configs.
Mac users can go to Outlook > Preferences > Privacy.
Check Turn on optional connected experiences, then select OK.
Restart Outlook, and you should be good to go.
