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mukulgoel's avatar
mukulgoel
Copper Contributor
Jul 23, 2025

Outlook Web Addin - Need to set Custom Properties in Compose Mode without using Task Pane

I am working on a feature in outlook web add-in where I need to set one custom property in Compose mode without using task pane this will mark and differentiate my email. Same value I will read in On Send event and based on the value I will take decision. I have tried so many ways to achieve that and not able to set custom property. Any help would be great.

outlook js
Outlook Web

2 Replies

  • Jaster's avatar
    Jaster
    Iron Contributor
    Jul 24, 2025

    You can set custom properties in compose mode through add-in manifest configuration plus the Office.js API.

    • mukulgoel's avatar
      mukulgoel
      Copper Contributor
      Jul 25, 2025

      I tried to set custom property, but it can only be set via having Task Pane open. Just based on Client-Side JS we can't set it up.

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