How can I find all Conversation IDs for an email message in Outlook?

Yes, it is possible to retrieve all conversation IDs for an email message in Outlook using the message's Internet Message ID. This can be particularly useful when dealing with messages that have changed their subjects and thus altered their conversation IDs. Here's a method to achieve this using Microsoft Graph API.

Using Microsoft Graph API

Microsoft Graph API provides a way to access Microsoft 365 data, including Outlook mail data. You can use it to retrieve email messages and their properties, including conversation IDs.

Steps to Retrieve Conversation IDs

1. Get the Message by Internet Message ID:
   • Use the /messages endpoint with the $filter parameter to search for the email message using the Internet Message ID.
2. Retrieve the Conversation ID:
   • Once you have the message, you can retrieve its conversation ID.
3. Search for Related Messages:
   • Use the conversation ID to search for all related messages in the conversation.

Example Code Using Microsoft Graph API

Here’s an example using Microsoft Graph API to retrieve the conversation IDs for a message:

Step 1: Get Access Token

Make sure you have the necessary permissions (Mail.Read, Mail.ReadBasic, Mail.ReadWrite) and obtain an OAuth 2.0 access token.

Step 2: Retrieve the Message by Internet Message ID

GET https://graph.microsoft.com/v1.0/me/messages?$filter=internetMessageId eq '<InternetMessageID>'

Authorization: Bearer <AccessToken>

Replace <InternetMessageID> with the actual Internet Message ID of the email and <AccessToken> with your OAuth token.

Step 3: Extract the Conversation ID

The response will include the message details, including the conversation ID.

{

    "value": [

        {

            "id": "AAMkADkA...",

            "conversationId": "AAQkADkA...",

            "subject": "Your Subject",

            ...

        }

    ]

}

Step 4: Retrieve All Messages in the Conversation

GET https://graph.microsoft.com/v1.0/me/messages?$filter=conversationId eq '<ConversationID>'

Authorization: Bearer <AccessToken>

Replace <ConversationID> with the conversation ID obtained in the previous step.

Python Example Using Microsoft Graph SDK

Here’s an example using Python and the Microsoft Graph SDK:

from msal import ConfidentialClientApplication

import requests

# Initialize the MSAL Confidential Client Application

client_id = 'YOUR_CLIENT_ID'

client_secret = 'YOUR_CLIENT_SECRET'

tenant_id = 'YOUR_TENANT_ID'

authority = f'https://login.microsoftonline.com/{tenant_id}'

scope = ['https://graph.microsoft.com/.default']

app = ConfidentialClientApplication(client_id, authority=authority, client_credential=client_secret)

token_response = app.acquire_token_for_client(scopes=scope)

access_token = token_response['access_token']

# Step 2: Retrieve the Message by Internet Message ID

internet_message_id = '<InternetMessageID>'

headers = {'Authorization': f'Bearer {access_token}'}

url = f'https://graph.microsoft.com/v1.0/me/messages?$filter=internetMessageId eq \'{internet_message_id}\''

response = requests.get(url, headers=headers)

message = response.json()['value'][0]

conversation_id = message['conversationId']

# Step 4: Retrieve All Messages in the Conversation

url = f'https://graph.microsoft.com/v1.0/me/messages?$filter=conversationId eq \'{conversation_id}\''

response = requests.get(url, headers=headers)

messages = response.json()['value']

# Print all messages in the conversation

for msg in messages:

    print(f"Subject: {msg['subject']}, Conversation ID: {msg['conversationId']}")

By following these steps, you can track and match messages that have changed subjects and conversation IDs with the original conversation ID.