Step 1: Download the Navatar Manifest XML file present at the bottom of this article.
Step 2: In MS Outlook, click the “Files” tab on the ribbon. Scroll below in the Info segment on the left and select “Manage Add-ins”.
Alternatively, click link https://aka.ms/olksideload to open the manage add-ins page. If prompted, login into your Microsoft 365 account.
Step 3: In the popup that opens in the new browser window, select My Add-ins. Scroll down and click on Add a custom add-in. Select Add from File and locate the manifest file on your system.
Step 4: Select the manifest file from your computer to install the plugin.
Step 5: Once installed, you’ll see the Navatar icon in your Outlook mailbox. This change may take some time to sync with your Outlook.