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Convert OLM to HTML via C#

Convert OLM to HTML without needing Microsoft® Outlook® or Thunderbird® installed.

In order to convert OLM to HTML, we’ll use Aspose.Email for .NET API which is a feature-rich, powerful and easy to use document manipulation and conversion API for C# platform. Open NuGet package manager, search for Aspose.Email and install. You may also use the following command from the Package Manager Console.

<h3>Package Manager Console Command</h3>

PM> Install-Package Aspose.EMAIL

Steps to Convert OLM to HTML via C#

.NET programmers can easily load & convert OLM files to HTML in just a few lines of code.

  1. Load source EML file using MailMessage.Load
  2. Set SaveOptions
  3. Call Save method with SaveOptions as parameter

System Requirements

Before running the .NET conversion source code, make sure that you have the following prerequisites.

  • Microsoft Windows or a compatible OS with .NET Framework, .NET Core, and PHP, VBScript, Delphi, C++ via COM Interop.
  • Development environment like Microsoft Visual Studio.
  • Aspose.EMAIL for .NET DLL referenced in your project.

This sample code shows OLM to HTML C# Conversion

using Aspose.Email;
using Aspose.Email.Storage.Olm;

using (var olm = OlmStorage.FromFile("filename.olm"))
    var folder = olm.GetFolder("Inbox", true);

    foreach (var msg in folder.EnumerateMapiMessages())
        // save message in html format
        msg.Save($"{msg.Subject}.html", SaveOptions.DefaultHtml);
  • Free App to Convert OLM to HTML