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On the Home tab, selectÂ
 All Apps. -
Select Add Apps. and search for an add-in.
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Choose the name of the add-in and select Add.
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InÂ
new Outlook, on the left navigation bar, select  More apps. -
Select Add apps, then select Manage your apps to see which ones have already been added to Outlook.
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For each installed add-in listed there, you can select More options (
) to see more details about the add-in or to remove it.
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In Outlook for Mac, select More options and chooseÂ
 Get Add-ins. -
Search for and add any add-ins you want.
Select My add-ins to manage add-ins that have already been added.