Aspose.Email  for .NET

Extract OST Metadata via .NET

Build your own .NET apps to add, edit, remove or extract metadata from OST files using server-side APIs.

How to Extract OST Metadata Using C#

In order to extract OST metadata, we’ll use

Aspose.Email for .NET

API which is a feature-rich, powerful and easy to use document metadata 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 to Extract Metadata of OST via C#

Get the type of the message while using GetProperties which in turn allows getting all metadata information via a simple loop.

  • Load the OST file via an object of MapiMessage
  • Get message type to access all properties
  • Loop through each property to access its value

System Requirements

Aspose.Email for .NET is supported on all major operating systems. Just make sure that you have the following prerequisites.

  • Microsoft Windows or a compatible OS with .NET Framework, .NET Core, and Xamarin Platforms.
  • Development environment like Microsoft Visual Studio.
  • Aspose.Email for .NET referenced in your project.

Extract Metadata of OST - C#

// load the message in with MapiMessage.Load
var mail = Aspose.Email.Mapi.MapiMessage.Load("template.ost", new Aspose.Email.OstLoadOptions());
Type type = mail.GetType();
// iterate over all properties to display the values
foreach (var prop in type.GetProperties())
    Console.WriteLine("Name: " + prop.Name + " Value: " + prop.GetValue(mail).ToString());
  • 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.

    Extract Metadata of OST via Online App

    View & edit Metadata to OST documents by using our Live Demos with following benefits.

      No need to download or setup anything
      No need to write any code
      Just upload your OST file & edit document properties
      Instantly get the download link for the resultant file

    OST What is OST File Format

    OST or Offline Storage Files represent user's mailbox data in offline mode on local machine upon registration with Exchange Server using Microsoft Outlook. It is automatically created on the first use of Microsoft Outlook upon connectivity with server. Once the file is created, the data is synchronized with the email server so that it is available offline as well in case of disconnectivity from email server. OST files can user mailbox items such as emails, contacts, calendar information, notes, tasks and other similar data. Users can create emails and other data items in OST file even in the absence of connection to the server, but these will not be synchronized with the server. Once the connection is established, the local file is synchronized with the server again so that both the server and the local copy are at the same level of information.

    Read More

    Other Supported Metadata Formats

    Using C#, One can also manipulate metadata of many other formats including.

    EML (Outlook Email Messages)
    MBOX (Electronic Mail Messages)
    MSG (Outlook & Exchange Format)
    PST (Outlook Personal Storage Files)