How to Sideload the Sendent Add-in for Outlook

Sideloading allows you to load and test your Outlook add-in directly in your Outlook client without first publishing it to an add-in catalog. This process is essential for immediate and efficient testing across different devices, including the web, Windows, Mac, and mobile platforms.

If sideloading is allowed by your administrator, you can either side load and add-in manually or automatically through the command line. Below are the steps on how you can manually sideload the Sendent Add-in through the Add-Ins for Outlook dialog.

1. In your preferred browser, go to https://aka.ms/olksideload. Outlook on the web opens, then the Add-Ins for Outlook dialog appears after a few seconds.

2. If your mailbox toolbar looks like the following image, you're using the classic version of Outlook on the web. Header of the classic Outlook on the web toolbar with "Office 365 | Outlook" as its title.

3. To access the Add-Ins for Outlook dialog, open Outlook on the web. Then, select the gear icon from the top-right section of the toolbar and choose Manage add-ins. The Manage add-ins option is selected in classic Outlook on the web.

Note that your organization may include its own logo in the mailbox toolbar, so you might see something slightly different from what is shown in the preceding images.

4. In Outlook on Windows, you can also access the Add-Ins for Outlook dialog by selecting File > Info > Manage Add-ins. This opens Outlook on the web in your preferred browser, then loads the dialog.

5. In Outlook on Mac, starting in Version 16.85 (24051214), the Get Add-ins button no longer opens the Add-Ins for Outlook dialog. Instead, it opens AppSource in your default browser. Earlier versions can still access the Add-Ins for Outlook dialog through the Get Add-ins button. If you don't see Get Add-ins in your version of Outlook, select the ellipsis button (...) from the ribbon, then select Get Add-ins. The Get Add-ins option is selected from the ellipsis button in Outlook on Mac.

6. In the Add-Ins for Outlook dialog box, select My add-ins tab.

7. Locate the Custom Addins section at the bottom of the dialog box. Select the Add a custom add-in link, and then select Add from File.

8. Select the Add a Custom Add-in link, and then select Add from File.

The Add from URL option is no longer available to sideload a custom Outlook add-in. As a workaround, open the URL in your preferred browser to download the manifest file, then use the Add from File option to sideload the add-in.

9. Locate the manifest file for your custom add-in and install it. Accept all prompts during the installation.

10. Click the Install button.

11. In Outlook on Windows, it may take up to 24 hours for your manually sideloaded add-in to appear in the client. This is due to caching.

12. Sendent for Outlook Add-in should now be visible under the custom add-ins.