Need to add custom icon from mapi property in mailbox from outlook web add-in office.js

[Rajnish-Asite]

Your Environment

• Platform [PC desktop, Mac, iOS, Office on the web]: Windows, OWA
• Host [Excel, Word, PowerPoint, etc.]: Outlook
• Office version number: Microsoft® Outlook® for Microsoft 365 MSO (Version 2305 Build 16.0.16501.20074) 64-bit
• Operating System: Windows
• Browser (if using Office on the web): Chrome

Expected behavior

Green tick icon should be displayed on outlook mailbox item from outlook web add-in office.js.

Current behavior

We need to show Green tick icon in mailbox item as we are showing from VSTO Pluging using below code-
mailItem.PropertyAccessor.SetProperty("http://schemas.microsoft.com/mapi/proptag/0x10800003", 312)

Now we need to set Green tick in mailbox item from web add-in So we tried custom properties as well as single extended value property to set on mailItem but still we are not able to show Green tick.

Steps to reproduce

1. First we tried to add custom property as below

Office.context.mailbox.item.loadCustomPropertiesAsync((result) => {
    console.log(result);
    let customProps = result.value;
    customProps.set("http://schemas.microsoft.com/mapi/proptag/0x10800003", 312);
    customProps.saveAsync((asyncResult) => {
        console.log(asyncResult);
    })
});

2. Second We tried with updateMessage reqeust from graph api to modify/add singleValueExtendedProperties in mailItem

async updateMessage(itemId) {
    try {
      const accessToken = await this.getMicrosoftAccessToken();
      return await fetch('/me/messages/'+ itemId , {
        method: 'PATCH',
        headers: {
          'content-type': 'application/json',
          authorization: `Bearer ${accessToken}`
        },
        body: JSON.stringify({
          singleValueExtendedProperties: [
            {
               "id":"String {e7abc95f-cf74-4d45-880c-04a779a6541b} Name 0x10800003",
               "value": "312"
            }
          ]
        })
      }).then(res => res.json());
    } catch (e) {
      console.log(e);
    }
 }

Context

We have developed web add-in to save emails directly on our Cloud So after saving email we are showing green tick on that saved mail item for user better experience. So this Green tick is very important feature for us.

Please do needful asap.

[exextoc]

Hi @Rajnish-Asite
Currently the feature to add a custom icon to outlook mailbox items is not there. We track Outlook add-in feature requests on our Tech Community Page.Please add your request there and select appropriate labels. Feature requests on Tech Community are considered, when we go through our planning process.

[ghost]

This issue has been automatically marked as stale because it is marked as needing author feedback but has not had any activity for 4 days. It will be closed if no further activity occurs within 3 days of this comment. Thank you for your interest in Office Add-ins!

[ghost]

This issue has been closed due to inactivity. Please comment if you still need assistance and we'll re-open the issue.

[Rajnish-Asite]

@exextoc New Feature request has been raised on your Tech Community Page as given below-
https://techcommunity.microsoft.com/t5/microsoft-365-developer-platform/add-a-custom-icon-to-outlook-mailbox-items-from-outlook-web-add/idi-p/3856477