VB.NET - Import RFC822 message (*.eml) emails to Outlook INBOX/PST file

The following VB.NET codes demonstrates how to import RFC822 message files to Outlook INBOX/PST file. It requires Outlook is installed on current machine.


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


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 Installation path\Lib\[netversion]\EAGetMail.dll, 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 2.0, 4.0, 4.5, 4.6.1, 4.7.2, 4.8.1, .NET 6.0, NET 7.0, .NET 8.0, .NET Standard 2.0 and .Net Compact Framework 2.0, 3.5.

File .NET Framework Version
Lib\net20\EAGetMail.dll Built with .NET Framework 2.0
It requires .NET Framework 2.0, 3.5 or later version.
Lib\net40\EAGetMail.dll Built with .NET Framework 4.0
It requires .NET Framework 4.0 or later version.
Lib\net45\EAGetMail.dll Built with .NET Framework 4.5
It requires .NET Framework 4.5 or later version.
Lib\net461\EAGetMail.dll Built with .NET Framework 4.6.1
It requires .NET Framework 4.6.1 or later version.
Lib\net472\EAGetMail.dll Built with .NET Framework 4.7.2
It requires .NET Framework 4.7.2 or later version.
Lib\net481\EAGetMail.dll Built with .NET Framework 4.8.1
It requires .NET Framework 4.8.1 or later version.
Lib\net6.0\EAGetMail.dll Built with .NET 6.0
It requires .NET 6.0 or later version.
Lib\net7.0\EAGetMail.dll Built with .NET 7.0
It requires .NET 7.0 or later version.
Lib\net8.0\EAGetMail.dll Built with .NET 8.0
It requires .NET 8.0 or later version.
Lib\netstandard2.0\EAGetMail.dll Built with .NET Standard 2.0
It requires .NET Standard 2.0 or later version.
Lib\net20-cf\EAGetMail.dll Built with .NET Compact Framework 2.0
It requires .NET Compact Framework 2.0, 3.5 or later version.
Lib\net35-cf\EAGetMail.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.

VB.NET - Import emails to Outlook

The following example codes demonstrate importing emails from Outlook PST file to RFC822 message files.


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

Imports Outlook = Microsoft.Office.Interop.Outlook
Imports System.Runtime.InteropServices
Imports EAGetMail
Imports System.IO

Module Module1

    ' Export emails from Outlook folder/PST file to rfc822 message files.
    Sub ExportMailItemToRfc822(ByRef folder As Outlook.Folder, ByVal destFolder As String)
        Dim items = folder.Items
        For i As Integer = 1 To items.Count
            Dim mailItem = CType(items(i), Outlook.MailItem)

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

            Dim mail = New EAGetMail.Mail("TryIt")

            Dim rfc822MessageFile As String = String.Format("{0}\rfc822_{1}.eml", destFolder, i)
            mail.SaveAs(rfc822MessageFile, True)

    End Sub

    ' Import rfc822 email file to Outlook Inbox folder Or PST file.
    Sub ImportSingleRfc822Message(ByVal fileName As String)

        Dim app = New Outlook.Application()
        Dim folder = app.GetNamespace("MAPI").

        ' If you want to create a New PST file
        ' Or existed PST file to store the imported
        ' message, you can use the following codes.
        ' app.Session.AddStore("d:\tempFolder\test.pst");
        ' Dim folder = app.GetNamespace("MAPI").Folders.GetLast()

        Dim mail = New EAGetMail.Mail("TryIt")
        Dim rfc822File As String = fileName
        mail.Load(rfc822File, False)

        Dim tempMsgFile As String = rfc822File & ".msg"
        mail.SaveAsOMSG(tempMsgFile, True, False)

        Dim item = CType(app.Session.OpenSharedItem(tempMsgFile), Outlook.MailItem)



    End Sub

    Sub Main()
        ' import all *.eml file in source folder to outlook inbox.
        Dim files = Directory.GetFiles("d:\sourcefolder", "*.eml")

        ' You can use the following code to import a single rfc822 message file.
        ' ImportSingleRfc822Message("d:\sourcefolder\test.eml")
    End Sub

End Module



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