The application aims to explore Graph API with the latest version of Graph .NET SDK integrated into the MAUI app.

Since version 5 there is a new way of model and client generation (Kiota) and it's good to be familiar with the latest SDK and find out what has been changed and what are the benefits of SDK version 5.

The main focus is on extended properties :

• MAPI properties accessible through single-value/multi-value extended properties on message, event, calendar, mailFolder, contact and contactFolder resources
• schema extensions
• extension properties

The app allows to list schema extensions and filter extensions by a name.

You can create one schema extension for user resource called githubaccounts with two properties workaccount and personalaccount.

It's quite common that employees working for IT companies must have work account for GitHub. Very often many employees also have a personal GitHub account.

The app allows to edit both accounts for all users. The values are saved to schema extension on the instance of user resource.

Because the name of the extension schema is generated by Graph API and is more or less random I decided to use extension property of application resource to store the name of githubaccounts schema extension.

I chose this option to try out how to easy/hard are basic operations with extension properties in SDK v5.

Main focus is on MAPI properties. The app allows to list and filter user's messages, events, calendars, mail folders, contacts and contacts folders.

Single-value and multi-value extended properties allow storing custom data and specifically serve as a fallback mechanism for apps to access custom data for Outlook MAPI properties.

For each resource mentioned above you can inspect MAPI properties.

You can inspect

• MAPI property tags
• property lid
• named properties
• custom named properties

The app displays details of selected properties:

• id
• name
• type
• property set
• value of single-value/multi-value
• valid id formats for single-value/multi-value extended properties
• Graph API query to read value

You can edit the value of named properties.

Application allows to configure which MAPI properties and for which resource should be displayed in UI.

The configuration is stored in Resources/Raw/pidpropertiesmapping.json file. There are four dictionaries. Possible keys for each dictionary are: Messagges, Events, Calendars, ContactFolders, Contacts, MailFolders.

Possible values are either pid tag, pid lid, pid name or custom name.

Example:

{
  "ResourceTagProperties":{
    "Messages":[
      "PidTagEntryId",
      ...
    ],
    ...
  },
  "ResourceLidProperties":{
    "Messages":[
      "PidLidCommonStart",
      ...
    ],
    ...
  },
  "ResourceNamedProperties":{
    "Messages":[
      "PidNameMessageId",
      ...
    ],
    ...
  },
  "ResourceCustomNamedProperties":{
    "Messages":[
      "InternalSystemId",
      ...
    ],
    ...
  }
}

Check PidLidProperties.cs, PidNameProperties.cs and PidTagProperties.cs for more details about possible values.

User can configure own set of named properties. Application allows to set a value for these custom named properties.

The configuration is stored in Resources/Raw/customnamedproperties.json. Simply add name of custom property, its type and guid of property set.

Possible values for Type are: String, Integer, Short, Double, Boolean, SystemTime, StringArray, IntegerArray, ShortArray, DoubleArray, BooleanArray, SystemTimeArray.

Properties of type String, Integer, Short, Double, Boolean, SystemTime represent single-value extended properties.

Properties of type StringArray, IntegerArray, ShortArray, DoubleArray, BooleanArray, SystemTimeArray represent multi-value extended properties.

[
  {
	"Name": "PropertyName",
    "Type": "String|Integer|Short|Double|Boolean|SystemTime|StringArray|IntegerArray|ShortArray|DoubleArray|BooleanArray|SystemTimeArray",
    "PropertySet": "{00020329-0000-0000-C000-000000000046}"
  }
]

Example of MAPI for a message:

Validation of property value is made on Graph API side. Copy button on the right insert graph expand query to the clipboard, so you reuse the expand query for example in Graph Explorer.

You can list all the user's messages (app returns only 50 first messages) and filter them either by subject (contains), sender mail (eq), start date (ge) or end date (le).

If both subject and sender mail is specified then or condtional operator is used for filtering.

For each message a sender, subject and received date time (utc) is displayed.

Click on Inspect MAPI button to check MAPI details.

You can list all the user's calendars and check their MAPI properties. The background color reflects specified color of the calendar.

You can list all the user's events from specific calendar. The user's default calendar is pre-selected.

The start and end date time in the event's detail reflects the selected time zone. The default is the local time zone.

Use Previous week and Next week buttons to list events backward and forward. Use Current week to return to default.

Range for displayed events is one work week started on Monday.

You can list all the user's mail folders (app returns only 20 first mail folders).

You can list all the user's contacts (app returns only 50 first contacts).

You can list all the user's contact folders (app returns only 10 first contact folders).

You can list all schema extensions. In details the app shows properties of the schema extension.

You can filter schema extension by it's id (Graph API support only eq operator). Only first 100 extensions is returned by the app (Graph API doesn't support select to return only specific properties and reduce the size of the response).

Example of the extension detail

You can list users and see their GitHub accounts. The color on the left indicates the presence of the user.

Filter user by displayName (startsWith)

Click on Edit accounts button to see the user's details like photo and managers. In the detail GitHub accounts can be edited.

Click on Export to CSV button to export an overview of filtered users to CSV file. The file is stored on the default drive (document library) of the root SharePoint site.

Click on Send to mail button to send mail with overview to the user's mail.

The app implements very simple drive items browser. User can browse items either on the user's OneDrive or on the default drive of the root SharePoint site.

Click on the folder to browse items in the folder.

Click on the file to see the preview of the file.

To return back from either MAPI property details etc. you can use back button in the left upper corner.

Create a new application in Azure AD with the following delegated permissions for Microsoft Graph:

• User.Read
• User.Read.All
• User.ReadWrite.All
• Mail.Read
• Mail.ReadWrite
• Mail.Send
• Application.ReadWrite.All
• Presence.Read
• Presence.Read.All
• Files.ReadWrite.All
• Sites.ReadWrite.All
• Calendars.ReadWrite
• Contacts.ReadWrite

All required delegated permissions are predefined in MapiExplorer.UI\appsettings.json.

Clone the repository and copy application (client) id and tenant id into MapiExplorer.UI\appsettings.json file.

{
  "AzureAd": {
    "ClientId": "{application_id}",
    "TenantId": "{tenant_id}",
    "Scopes": "...",
    ...
  },
  ...
}

Build and run the application. You will be prompted to sign-in with the correct account.

In case of any troubles or unexpected behavior all errors are logged into MapiExplorer.log. For debugging the log is placed in ..\MapiExplorer.UI\bin\Debug\net7.0-windows10.0.xxx.0\win10-x64\AppX\

Only supported platform is Windows. The app was tested only on Windows.