Aspose.Email  for .NET

Compare PST Formats in C#

Native and high performance PST message comparison using server-side Aspose.Email for .NET APIs with out the need of Microsoft Office or PDF installation.

How to Compare PST File Using C#

In order to compare PST file, we’ll use

Aspose.Email for .NET

API which is a feature-rich, powerful and easy to use document manipulation API for C# platform. Open


package manager, search for Aspose.Email and install. You may also use the following command from the Package Manager Console.


PM> Install-Package Aspose.Email

Steps for Comparing PST Files in C#

A basic message comparison with

Aspose.Email for .NET

APIs can be done with just a few lines of code to compare Outlook, Gmail, Apple Mail, Thunderbird documents and get difference between two emails.

  • Load the two mail files for comparison.
  • Get the body content for each mail file.
  • Compare using GetMatrix Method.
  • List the differences and set the body content.
  • Save the file.

System Requirements

Our APIs are supported on all major platforms and Operating Systems. Before executing the code below, please make sure that you have the following prerequisites on your system.

  • Microsoft Windows or a compatible OS with .NET Framework, .NET Core, and Xamarin Platforms
  • Development environment like Microsoft Visual Studio
  • Aspose.Email for .NET DLL referenced in your project - Install from NuGet using the Download button above

Compare PST Files - C#

// fileName1 = pst first file to compare
// fileName2 = pst second file to compare
var email1 = MapiHelper.GetMapiMessageFromFile(Path.Combine(Config.Configuration.WorkingDirectory, folderName, fileName1));
var email2 = MapiHelper.GetMapiMessageFromFile(Path.Combine(Config.Configuration.WorkingDirectory, folderName, fileName2));

var body1 = email1.Body.Split(new string[] { " " }, StringSplitOptions.None).SelectMany(SplitOfNewLine).ToArray();
var body2 = email2.Body.Split(new string[] { " " }, StringSplitOptions.None).SelectMany(SplitOfNewLine).ToArray();

var lcsMatrix = GetMatrix(body1, body2, StringComparer.Ordinal);

var list = new List( LSTnode(string))();

ListDiffTreeFromBacktrackMatrix(list, lcsMatrix, body1, body2, StringComparer.Ordinal);

email2.SetBodyContent(BuildBodyDiff(list), Email.Mapi.BodyContentType.Html);

  • About Aspose.Email for .NET API

    Aspose.Email is a Microsoft Outlook and Thunderbird formats parsing solution. One can easily create, manipulate, convert email and storage formats such as MSG, EMLX, EML and MHT. Handling of email attachments, customization of message headers and implementation of different network protocols like POP3, IMAP & SMTP to send & receive emails is much easier. Its a standalone API and does not require Microsoft Outlook or any other software installation.

    Online PST Comparison Live Demos

    PST What is PST File Format

    Files with .PST extension represent Outlook Personal Storage Files (also called Personal Storage Table) that store variety of user information. User information is stored in folders of different types that include emails, calendar items, notes, contacts, and several other file formats. PST files are used for archiving emailing data offline that can be later loaded and viewed in various applications.

    Read More

    Other Supported Comparison Formats

    Using C#, One can also compare many other Email files including.

    EML (Outlook Email Messages)
    MBOX (Electronic Mail Messages)
    MSG (Outlook & Exchange Format)
    OST (Offline Storage Files)