Convert PST to MSG

Converts a message stored in a PST file to an individual MSG file.

Code

using DRIT.Mail;
using DRIT.Mail.Conversion;
using DRIT.Mail.Pst.PhysicalLayout;

// Open the PST file
using var pst = new PstFile("archive.pst");

// Enumerate folders and messages
foreach (var folder in pst.Folders.GetAllFoldersFlatDepthFirst())
{
    foreach (var mapiMessage in folder.GetMapiMessages())
    {
        // Convert the PST-backed message to an MSG file
        string outputName = $"{mapiMessage.Subject ?? "message"}.msg";
        MailMessageConverter.PstMessageToMsg(mapiMessage, outputName);
    }
}

Remarks

MailMessageConverter.PstMessageToMsg writes a PST-backed MapiMessage to an MSG compound file. An overload accepting a Stream is also available for in-memory conversion.