Convert PST or OST document contents to different formats

var index = 1;
LoadOptions LoadOptionsProvider(FileType sourceType)
{
    if (sourceType == PersonalStorageFileType.Ost)
    {
        return new PersonalStorageLoadOptions
        {
            ConvertOwned = true,
            ConvertOwner = false,
            Folder = @"Root - Mailbox", 
            Depth = 2
        };
    }
    return null;
}
Stream ConvertedStreamProvider(FileType targetType)
{
    string outputFile = $"converted-{index++}.{targetType.Extension}"
    return new FileStream(outputFile, FileMode.Create);
}
ConvertOptions ConvertOptionsProvider(string sourceDocumentName, FileType sourceType)
{
    if (sourceType == EmailFileType.Msg)
    {
        return new PdfConvertOptions();
    }
    return new WordProcessingConvertOptions();
}

using (var converter = new Converter("sample.ost", LoadOptionsProvider))
{
    converter.Convert(ConvertedStreamProvider, ConvertOptionsProvider);
}