naftiko/skills/create-single-value-extended-property
skills/create-single-value-extended-property/SKILL.md
# Create Single-Value Extended Property Create a single-value MAPI extended property on a message. ## API Details - **API**: Microsoft Outlook Mail API - **Method**: POST - **Path**: `/me/messages/{message-id}/singleValueExtendedProperties` - **Operation ID**: `createSingleValueExtendedProperty` - **Tag**: ExtendedProperties - **OpenAPI**: [microsoft-outlook-mail-api.yaml](../../openapi/microsoft-outlook-mail-api.yaml) ## Sandbox Mock server URL: `http://localhost:8080/rest/microsoft-outloo
development
Updated Apr 8, 2026
$ install --global
skillsauthnpx skillsauth add naftiko/microsoft-outlook-sandbox skills/create-single-value-extended-propertyInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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SKILL.md
Create Single-Value Extended Property
Create a single-value MAPI extended property on a message.
API Details
- API: Microsoft Outlook Mail API
- Method: POST
- Path:
/me/messages/{message-id}/singleValueExtendedProperties - Operation ID:
createSingleValueExtendedProperty - Tag: ExtendedProperties
- OpenAPI: microsoft-outlook-mail-api.yaml
Sandbox
Mock server URL: http://localhost:8080/rest/microsoft-outlook-mail-api/1.0.0/me/messages/{message-id}/singleValueExtendedProperties
Required Headers
Authorization: Bearer {access-token}Content-Type: application/json
OAuth Scopes
Mail.ReadWrite
Parameters
| Parameter | In | Type | Required | Description | |-----------|-----|------|----------|-------------| | message-id | path | string | Yes | The unique identifier of the message |
Request Body
| Field | Type | Description | |-------|------|-------------| | id | string | The property identifier in the format: Type {GUID} Name PropertyName | | value | string | The property value |
Example Request
curl -X POST "http://localhost:8080/rest/microsoft-outlook-mail-api/1.0.0/me/messages/AAMkAGVmMDEzMTM4/singleValueExtendedProperties" \
-H "Authorization: Bearer {access-token}" \
-H "Content-Type: application/json" \
-d '{
"id": "String {66f5a359-4659-4830-9070-00047ec6ac6e} Name Color",
"value": "Green"
}'
Example Response
{
"id": "String {66f5a359-4659-4830-9070-00047ec6ac6e} Name Color",
"value": "Green"
}
Instructions
Use this operation to create a single-value MAPI extended property on a message. Extended properties allow you to store custom MAPI properties that are not otherwise available through the Microsoft Graph API. The property identifier follows the format "Type {GUID} Name PropertyName". Returns 201 on success.
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