Does unfurling provided by customized APP work on Outlook Desktop or Mobile APP?

Question

Hi Team,

My APP has been published and is available in the APP Store. While I'm able to install it in the Web version of Outlook, I don't know where to find it on the Outlook Desktop or Mobile APP.

And the unfurling function provided by my APP only works on Web, below is the screenshot:

Here is my question:

Does the Outlook Desktop or Mobile APP supports installing customized APP like the Web, and produce the same unfurling result as shown in above picture? If yes, How?

Hope to get help from your side!

Thanks,

Ye Lan

Answer 1

Hi Ye Lan,

For Windows:

• Open Outlook Desktop > Go to File > Manage Add-ins > Click "Get Add-ins" (or "More Add-ins").
• If your app is published in the Office Store, it should appear there.
• If it's sideloaded, you can install it via "My Add-ins" > "Add from file" (for .manifest.xml).

For mobile:

• Outlook Mobile does not currently support custom add-ins (except for a few Microsoft-approved ones).
• Unfurling behavior:
  • If your app provides link unfurling, it won’t work in Outlook Mobile unless Microsoft has explicitly enabled it.
    • Mobile apps typically rely on default link previews (like OpenGraph metadata) rather than custom unfurling.

Since your issue is more related to development, please kindly understand that the Outlook tag here we mainly focus on general issues about Outlook desktop client. In order to better solve your problem, it's suggested that you could post your case and share your manifest file in dedicated forum for Office Development for more professional advice.

Thanks for your support and understanding!

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