Outlook Mail (Office 365) Connector for C# Outlook Mail Connector (Office 365) can be used to integrate Office 365 Outlook Mail API in your App / BI Tools. You can download attachment, read / search Emails, Users, MailFolders, Send email and more. In this article you will learn how to quickly and efficiently integrate Outlook Mail (Office 365) data in C#. We will use high-performance Outlook Mail (Office 365) Connector to easily connect to Outlook Mail (Office 365) and then access the data inside C#. Let's follow the steps below to see how we can accomplish that! Download Documentation Outlook Mail (Office 365) Connector for C# is based on ZappySys API Driver which is part of ODBC PowerPack. It is a collection of high-performance ODBC drivers that enable you to integrate data in SQL Server, SSIS, a programming language, or any other ODBC-compatible application. ODBC PowerPack supports various file formats, sources and destinations, including REST/SOAP API, SFTP/FTP, storage services, and plain files, to mention a few.

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Create ODBC Data Source (DSN) based on ZappySys API Driver

Step-by-step instructions

To get data from Outlook Mail (Office 365) using C# we first need to create a DSN (Data Source) which will access data from Outlook Mail (Office 365). We will later be able to read data using C#. Perform these steps:

1. Download and install ODBC PowerPack.

2. Open ODBC Data Sources (x64):

   

3. Create a User data source (User DSN) based on ZappySys API Driver

   ZappySys API Driver

   
   • Create and use User DSN if the client application is run under a User Account. This is an ideal option in design-time, when developing a solution, e.g. in Visual Studio 2019. Use it for both type of applications - 64-bit and 32-bit.
   • Create and use System DSN if the client application is launched under a System Account, e.g. as a Windows Service. Usually, this is an ideal option to use in a production environment. Use ODBC Data Source Administrator (32-bit), instead of 64-bit version, if Windows Service is a 32-bit application.

4. When the Configuration window appears give your data source a name if you haven't done that already, then select "Outlook Mail (Office 365)" from the list of Popular Connectors. If "Outlook Mail (Office 365)" is not present in the list, then click "Search Online" and download it. Then set the path to the location where you downloaded it. Finally, click Continue >> to proceed with configuring the DSN:

   OutlookMailOffice365DSN

   Outlook Mail (Office 365)

   

5. Now it's time to configure the Connection Manager. Select Authentication Type, e.g. Token Authentication. Then select API Base URL (in most cases, the default one is the right one). More info is available in the Authentication section.

    User Credentials [OAuth]

   Use delegated access (User Credentials) whenever you want to let a signed-in user work with their own resources or resources they can access. Whether it's an admin setting up policies for their entire organization or a user deleting an email in their inbox, all scenarios involving user actions should use delegated access. [API reference]

   Steps how to get and use Outlook Mail (Office 365) credentials
   

   Follow these simple steps below to create Microsoft Entra ID application with delegated access:

   WARNING: If you are planning to automate processes, we recommend that you use a Application Credentials authentication method. In case, you still need to use User Credentials, then make sure you use a system/generic account (e.g. automation@my-company.com). When you use a personal account which is tied to a specific employee profile and that employee leaves the company, the token may become invalid and any automated processes using that token will start to fail.

   1. Navigate to the Azure Portal and log in using your credentials.
   2. Access Microsoft Entra ID.
   3. Register a new application by going to App registrations and clicking on New registration button:
      INFO: Find more information on how to register an application in Graph API reference.
   4. When configuration window opens, configure these fields:
      • Supported account type
        • Use Accounts in this organizational directory only, if you need access to data in your organization only.
      • Redirect URI:
        • Set the type to Public client/native (mobile & desktop).
        • Use https://zappysys.com/oauth as the URL.
      
   5. After registering the app, copy the Application (client) ID for later:
   6. Then copy OAuth authorization endpoint (v2) & OAuth token endpoint (v2) URLs to use later in the configuration:
   7. Now go to SSIS package or ODBC data source and use the copied values in User Credentials authentication configuration:
      • In the Authorization URL field paste the OAuth authorization endpoint (v2) URL value you copied in the previous step.
      • In the Token URL field paste the OAuth token endpoint (v2) URL value you copied in the previous step.
      • In the Client ID field paste the Application (client) ID value you copied in the previous step.
      • In the Scope field use the default value or select individual scopes, e.g.:
        • email
        • offline_access
        • openid
        • profile
        • Mail.Read
        • Mail.Read.Shared
        • Mail.ReadBasic
        • Mail.ReadBasic.Shared
        • Mail.ReadWrite
        • Mail.ReadWrite.Shared
        • Mail.Send
        • Mail.Send.Shared
        • User.Read
        • User.ReadBasic.All
   8. Press Generate Token button to generate Access and Refresh Tokens.
   9. Optional step. Choose Default User Id from the drop down menu (if someone shared a mailbox with you).
   10. Click Test Connection to confirm the connection is working.
   11. Done! Now you are ready to use the API Connector!

   Fill in all required parameters and set optional parameters if needed:

   OutlookMailOffice365DSN

   Outlook Mail (Office 365)

   User Credentials [OAuth]

   https://graph.microsoft.com/v1.0

   Required Parameters
   Authorization URL	Fill-in the parameter...
   Token URL	Fill-in the parameter...
   Client ID	Fill-in the parameter...
   Scope	Fill-in the parameter...
   Return URL	Fill-in the parameter...
   Optional Parameters
   Client Secret
   Refresh Token File Path
   Login Prompt Option
   Default User Id (Select after clicking **Generate Token**)	me
   RetryMode	RetryWhenStatusCodeMatch
   RetryStatusCodeList	429|503
   RetryCountMax	5
   RetryMultiplyWaitTime	True

   

    Application Credentials [OAuth]

   Application-only access is broader and more powerful than delegated access (User Credentials), so you should only use app-only access where needed. Use it when: 1. The application needs to run in an automated way, without user input (for example, a daily script that checks emails from certain contacts and sends automated responses). 2. The application needs to access resources belonging to multiple different users (for example, a backup or data loss prevention app might need to retrieve messages from many different chat channels, each with different participants). 3. You find yourself tempted to store credentials locally and allow the app to sign in 'as' the user or admin. [API reference]

   Steps how to get and use Outlook Mail (Office 365) credentials
   

   Follow these simple steps below to create Microsoft Entra ID application with application access permissions.

   1. Navigate to the Azure Portal and log in using your credentials.
   2. Access Microsoft Entra ID.
   3. Register a new application by going to App registrations and clicking on New registration button:
      INFO: Find more information on how to register an application in Graph API reference.
   4. When configuration window opens, configure these fields:
      • Supported account type
        • e.g. select Accounts in this organizational directory only if you need access to data in your organization only.
      • Redirect URI:
        • Set the type to Public client/native (mobile & desktop).
        • Leave the URL field empty.
      
   5. After registering the app, copy the Application (client) ID for later:
   6. Then copy OAuth authorization endpoint (v2) & OAuth token endpoint (v2) URLs:
   7. Continue and create Client secret:
   8. Then copy the Client secret for later steps:
   9. Continue by adding permissions for the app by going to the API permissions section, and clicking on Add a permission:
   10. Select Microsoft Graph:
   11. Then choose Application permissions option:
   12. Continue by adding these Mail (Outlook) permissions:
   13. Finish by clicking Add permissions button:
   14. Now it's time to Grant admin consent for your application:
   15. Confirm all the permissions are granted:
   16. Now go to SSIS package or ODBC data source and use the copied values in Application Credentials authentication configuration:
       • In the Token URL field paste the OAuth token endpoint (v2) URL value you copied in the previous step.
       • In the Client ID field paste the Application (client) ID value you copied in the previous step.
       • In the Client Secret field paste the Client secret value you copied in the previous step.
       • Choose Default User Id from the drop down menu.
   17. Click Test Connection to confirm the connection is working.
   18. That's it! Now you can use the API Connector!

   Fill in all required parameters and set optional parameters if needed:

   OutlookMailOffice365DSN

   Outlook Mail (Office 365)

   Application Credentials [OAuth]

   https://graph.microsoft.com/v1.0

   Required Parameters
   Token URL	Fill-in the parameter...
   Client ID	Fill-in the parameter...
   Client Secret	Fill-in the parameter...
   Scope	Fill-in the parameter...
   Default User Id	Fill-in the parameter...
   Optional Parameters
   RetryMode	RetryWhenStatusCodeMatch
   RetryStatusCodeList	429|503
   RetryCountMax	5
   RetryMultiplyWaitTime	True

   

6. Once the data source connection has been configured, it's time to configure the SQL query. Select the Preview tab and then click Query Builder button to configure the SQL query:

   

   ZappySys API Driver - Outlook Mail (Office 365)

   Outlook Mail Connector (Office 365) can be used to integrate Office 365 Outlook Mail API in your App / BI Tools. You can download attachment, read / search Emails, Users, MailFolders, Send email and more.

   OutlookMailOffice365DSN

   

7. Start by selecting the Table or Endpoint you are interested in and then configure the parameters. This will generate a query that we will use in C# to retrieve data from Outlook Mail (Office 365). Hit OK button to use this query in the next step.

   SELECT * FROM MyMessages

   
   Some parameters configured in this window will be passed to the Outlook Mail (Office 365) API, e.g. filtering parameters. It means that filtering will be done on the server side (instead of the client side), enabling you to get only the meaningful data much faster.

8. Now hit Preview Data button to preview the data using the generated SQL query. If you are satisfied with the result, use this query in C#:

   

   ZappySys API Driver - Outlook Mail (Office 365)

   Outlook Mail Connector (Office 365) can be used to integrate Office 365 Outlook Mail API in your App / BI Tools. You can download attachment, read / search Emails, Users, MailFolders, Send email and more.

   OutlookMailOffice365DSN

   SELECT * FROM MyMessages

   
   You can also access data quickly from the tables dropdown by selecting <Select table>.
   A WHERE clause, LIMIT keyword will be performed on the client side, meaning that the whole result set will be retrieved from the Outlook Mail (Office 365) API first, and only then the filtering will be applied to the data. If possible, it is recommended to use parameters in Query Builder to filter the data on the server side (in Outlook Mail (Office 365) servers).

9. Click OK to finish creating the data source.

Video Tutorial

Read data in C#

Using ODBC DSN

1. Create a new Console project and use this code to read the data:
   

   "OutlookMailOffice365DSN";

   

2. Press F5 to run the code and read the data:
   

3. Here is the code in text format:

   using System;
   using System.Data.Odbc;
   
   namespace ConsoleApp {
       class Program {
           static void Main() {
               var dsn = "OutlookMailOffice365DSN";
               using (var conn = new OdbcConnection(String.Format("DSN={0}", dsn)))
               {
                   conn.Open();
                   var cmd = new OdbcCommand("SELECT * FROM Products", conn);
                   
                   //Increase the timeout duration from the default 30 seconds, which may be insufficient in certain scenarios
                   cmd.CommandTimeout=600; // 600-Seconds
                   
                   var rdr = cmd.ExecuteReader();
                   while (rdr.Read())
                   {
                       for (int i = 0; i < rdr.FieldCount; i++)
                       {
                               Console.Write("{0}\t", rdr[i]);
                       }
                       Console.WriteLine();
                   }
               }
               Console.ReadKey();
           }
       }
   }
   

Using a full ODBC connection string

If you want to avoid being dependent on a DSN and creating multiple DSNs for each platform (x86, x64), then you can use a fully qualified connection string. Simply go to your DSN and copy the Connection String:

1. Open ODBC data source configuration and click Copy settings:
   

   ZappySys API Driver - Configuration [Version: 2.0.1.10418]

   ZappySys API Driver - Outlook Mail (Office 365)

   Outlook Mail Connector (Office 365) can be used to integrate Office 365 Outlook Mail API in your App / BI Tools. You can download attachment, read / search Emails, Users, MailFolders, Send email and more.

   OutlookMailOffice365DSN

   
2. The window opens, telling us the connection string was successfully copied to the clipboard:

3. Then in your C# code, pass the connection string as an argument when calling the OdbcConnection object's constructor, for example:

   var connectionString = @"DRIVER={ZappySys API Driver};ServiceUrl=https://graph.microsoft.com/v1.0;Provider=Custom;OAuthVersion=OAuth2;GrantType=Default;Scope=[$Scope$];ScopeSeparator={space};";
   
   using (var conn = new OdbcConnection(connectionString))
   {
       // your code goes here
   }

Limitations of using a full connection string

Despite using a full ODBC connection string may be very convenient it comes with a limitation: it's length is limited to 1024 symbols (or sometimes more). It usually happens when API provider generates a very long Refresh Token when OAuth is at play. If you are using such a long ODBC connection string, you may get this error:

"Connection string exceeds maximum allowed length of 1024"

But there is a solution to this by storing the full connection string in a file. Follow the steps below to achieve this:

1. Open your ODBC data source.
2. Click Copy settings button to copy a full connection string (see the previous section on how to accomplish that).
3. Then create a new file, let's say, in C:\temp\odbc-connection-string.txt.
4. Continue by pasting the copied connection string into a newly created file and save it.
5. Finally, the last step! Just construct a shorter ODBC connection string using this format:

   DRIVER={ZappySys API Driver};SettingsFile=C:\temp\odbc-connection-string.txt

6. Our troubles are over! Now you should be able to use this connection string in C# with no problems.

Actions supported by Outlook Mail (Office 365) Connector

Learn how to perform common Outlook Mail (Office 365) actions directly in C# with these how-to guides:

• Download Message Attachment (Single File)
• Download Message Attachments (Multiple Files) - Using Search Condition
• Get Mail Folder by Id [only works with User Credentials]
• Get Mail Folders
• Get Message Attachment
• Get Message Attachments
• Get Messages
• Get My Information
• Get My Mail Folders [only works with User Credentials]
• Get My Message by Id [only works with User Credentials]
• Get My Messages [only works with User Credentials]
• Get Table Columns
• Get Tables
• Get User by Id
• Get Users
• Send Mail
• Generic Request
• Generic Request (Bulk Write)

Conclusion

In this article we showed you how to connect to Outlook Mail (Office 365) in C# and integrate data without any coding, saving you time and effort. It's worth noting that ZappySys API Driver allows you to connect not only to Outlook Mail (Office 365), but to any Java application that supports JDBC (just use a different JDBC driver and configure it appropriately).

We encourage you to download Outlook Mail (Office 365) Connector for C# and see how easy it is to use it for yourself or your team.

If you have any questions, feel free to contact ZappySys support team. You can also open a live chat immediately by clicking on the chat icon below.

Download Outlook Mail (Office 365) Connector for C# Documentation

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