C# - Export Emails from Outlook PST file to RFC822 message files (*.eml)

The following c# codes demonstrates how to export emails from Outlook INBOX/PST file to RFC822 message files. It requires Outlook is installed on current machine.

Installation

Before you can use the following sample codes, you should download the EAGetMail Installer and install it on your machine at first. Full sample projects are included in this installer.

Install from NuGet

You can also install the run-time assembly by NuGet. Run the following command in the NuGet Package Manager Console:

Install-Package EAGetMail

Note

If you install it by NuGet, no sample projects are installed, only .NET assembly is installed.

Add Reference

To use EAGetMail POP3 & IMAP Component in your project, the first step is “Add reference of EAGetMail to your project”. Please create or open your project with Visual Studio, then go to menu -> Project -> Add Reference -> .NET -> Browse..., and select EAGetMail{version}.dll from installation path, click Open-> OK, the reference will be added to the project, you can start to use it to retrieve email and parse email in your project.

add reference in c#/vb.net/managed c++/cli

.NET Assembly

Because EAGetMail has separate builds for .Net Framework, please refer to the following table and choose the correct dll.

Separate builds of run-time assembly for .Net Framework 1.1, 2.0, 3.5, 4.0, 4.5 and .Net Compact Framework 2.0, 3.5.

File .NET Framework Version
EAGetMail.dll Built with .NET Framework 1.1
It requires .NET Framework 1.1, 2.0, 3.5 or later version.
EAGetMail20.dll Built with .NET Framework 2.0
It requires .NET Framework 2.0, 3.5 or later version.
EAGetMail35.dll Built with .NET Framework 3.5
It requires .NET Framework 3.5 or later version.
EAGetMail40.dll Built with .NET Framework 4.0
It requires .NET Framework 4.0 or later version.
EAGetMail45.dll Built with .NET Framework 4.5
It requires .NET Framework 4.5 or later version.
EAGetMailCF20.dll Built with .NET Compact Framework 2.0
It requires .NET Compact Framework 2.0, 3.5 or later version.
EAGetMailCF35.dll Built with .NET Compact Framework 3.5
It requires .NET Compact Framework 3.5 or later version.

Add Reference of Outlook Object

You also need to go to menu -> Project -> Add Reference -> .NET, Add Microsoft.Office.Interop.Outlook to your project.

C# - Export Emails from Outlook

The following example codes demonstrate exporting emails from Outlook INBOX/PST file to RFC822 message files

Note

To get full sample projects, please download and install EAGetMail on your machine.

using System;
using System.Collections.Generic;
using System.Text;
using Outlook = Microsoft.Office.Interop.Outlook;
using System.Runtime.InteropServices;
using EAGetMail;
using System.IO;

namespace PstTest
{
    class Program
    {
        // Export emails from Outlook folder/PST file to rfc822 message files.
        static void ExportMailItemToRfc822(Outlook.Folder folder, string destFolder)
        {
            var items = folder.Items;
            for (int i = 1; i < items.Count; i++)
            {
                var mailItem = (Outlook.MailItem)items[i];

                string tempMsgFile = string.Format("{0}\\temp_{1}.msg", destFolder, i);
                mailItem.SaveAs(tempMsgFile, Outlook.OlSaveAsType.olMSGUnicode);

                var mail = new EAGetMail.Mail("TryIt");
                mail.LoadOMSG(tempMsgFile);
                mail.Update();
                string rfc822MessageFile = string.Format("{0}\\rfc822_{1}.eml", destFolder, i);
                mail.SaveAs(rfc822MessageFile, true);

                File.Delete(tempMsgFile);
            }
        }

        static void Main(string[] args)
        {
            var app = new Outlook.Application();
            // get default inbox folder
            var folder = (Outlook.Folder)
                app.GetNamespace("MAPI").GetDefaultFolder(Outlook.OlDefaultFolders.olFolderInbox);

            /*
            * If you want to export emails from
            * existed PST file. You can use the following codes.
            * app.Session.AddStore("d:\\tempFolder\\source.pst");
            * var folder = app.GetNamespace("MAPI").Folders.GetLast();
            */

            ExportMailItemToRfc822(folder,
                "d:\\destFolder");

            (app as Outlook._Application).Quit();
        }
    }
}

Appendix

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