تحويل OST إلى MBOX عبر C#

using Aspose.Email.Mapi;
using Aspose.Email.Storage.Mbox;
using Aspose.Email.Storage.Pst;

using (var writer = new MboxrdStorageWriter("output.mbox", false))
using (var ost = PersonalStorage.FromFile("sourceFile.ost"))
{
    foreach (var folder in ost.RootFolder.GetSubFolders())
    {
        foreach (var msg in folder.EnumerateMapiMessages())
        {
            writer.WriteMessage(msg.ToMailMessage(new MailConversionOptions()));
        }
    }
}