تحويل OST إلى MSG عبر C#

using Aspose.Email.Storage.Pst;

using (var ost = PersonalStorage.FromFile("sourceFile.ost"))
{
    foreach (var folder in ost.RootFolder.GetSubFolders())
    {
        foreach (var msg in folder.EnumerateMapiMessages())
        {
            msg.Save($"{msg.Subject}.msg");
        }
    }
}