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How to update the Microsoft 365 add-in to enable support of Outlook mobile apps?

Ira | Newoldstamp avatar
Written by Ira | Newoldstamp
Updated this week

Note: The add-in is supported in the Outlook app on Android and iOS starting in version 4.23.52.0. You must also have a Microsoft 365 subscription to run this feature.

We are excited to let you know that we have deployed a new version, 2.1, of our add-in that works in the Outlook app on iOS and Android OS and is available for beta testing.
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To enable support for Outlook mobile apps, please follow these steps:


Step 1. Manually download the Newoldstamp manifest file.

Step 2. Add a manifest file to your Microsoft 365 admin center to update your add-in.

  • Open the Microsoft 365 admin center, go to Settings, Integrated apps, and the Add-ins page.

  • Click the deployed Newoldstamp add-in, then click Update add-in.

  • Select "I have the manifest file on this device", choose file, and click Update the add-in.

Note:Microsoft 365 can take up to 48 hours to process Outlook add-ins, and you may need to relaunch the Outlook app.

Step 3. Check your signatures in action on your mobile phone

  • After up to 48 hours, open your Outlook app on your mobile phone and enjoy your signature.

Note: If you want to enable signature support in Outlook on your mobiles but still have the old add-in version 1.8, please go to the admin center and delete it immediately after downloading the new app.

To remove an old app, please go to Microsoft 365 admin center > Settings > Integrated apps > Deployed apps > Add-ins > find and remove the old add-in.

If you have any other questions or concerns, please feel free to let us know anytime. ​We'll gladly help!

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