Appending Tiff files works on Windows 7 and Windows 2012 but doesn't work on Windows 2003 and Windows 2008

Question

Please help me! The code below creates perfect output file son windows 7 and 2012 but on windows 2008 and win 2003 the generated images are corrupted without generating any exception during the process.
Both win 2008 and win 2003 are up to date. What do I have to install? Some hotfix? Please help me I'm stuck.
public void appendTiffs(string tiff1inputFilePath, string tiff2inputFilePath, string outputFilePath)
            Stream imageStreamSource = null;
            try
                //Prepare encoders:
                System.Drawing.Imaging.ImageCodecInfo encoderInfo = getEncoderInfo("image/tiff");
                System.Drawing.Imaging.EncoderParameters encoderParams = new System.Drawing.Imaging.EncoderParameters(2);
                System.Drawing.Imaging.EncoderParameter compressionEncodeParam =
                    new System.Drawing.Imaging.EncoderParameter(System.Drawing.Imaging.Encoder.Compression, (long)System.Drawing.Imaging.EncoderValue.CompressionLZW);
                System.Drawing.Imaging.EncoderParameter saveEncodeParam =
                    new System.Drawing.Imaging.EncoderParameter(System.Drawing.Imaging.Encoder.SaveFlag, (long)System.Drawing.Imaging.EncoderValue.MultiFrame);
                encoderParams.Param[0] = compressionEncodeParam;
                encoderParams.Param[1] = saveEncodeParam;
                int numberOfPages = getNumberOfPages(tiff1inputFilePath);
                MemoryStream byteStream;
                imageStreamSource = new FileStream(tiff1inputFilePath, FileMode.Open, FileAccess.Read, FileShare.Read);
                System.Drawing.Bitmap sourceBitmap = (System.Drawing.Bitmap)getTifPage(imageStreamSource, 0, out byteStream);
                System.Drawing.Bitmap outputBitmap;                
                outputBitmap = (System.Drawing.Bitmap)System.Drawing.Image.FromStream(byteStream);
                outputBitmap.Save(outputFilePath, encoderInfo, encoderParams);                
                //For subsequent pages, prepare encoders:
                saveEncodeParam =
                        new System.Drawing.Imaging.EncoderParameter(System.Drawing.Imaging.Encoder.SaveFlag, (long)System.Drawing.Imaging.EncoderValue.FrameDimensionPage);
                encoderParams.Param[1] = saveEncodeParam;
                for (int i = 1; i < numberOfPages; i++)
                    sourceBitmap.Dispose();
                    byteStream.Close();
                    byteStream.Dispose();
                    sourceBitmap = (System.Drawing.Bitmap)getTifPage(imageStreamSource, i, out byteStream);
                    sourceBitmap.Save(byteStream, System.Drawing.Imaging.ImageFormat.Tiff);                    
                    System.Drawing.Bitmap tmpOutputBitmap = (System.Drawing.Bitmap)System.Drawing.Image.FromStream(byteStream);
                    outputBitmap.SaveAdd(tmpOutputBitmap, encoderParams);                    
                sourceBitmap.Dispose();
                byteStream.Close();
                byteStream.Dispose();
                imageStreamSource.Close();
                imageStreamSource.Dispose();
                imageStreamSource = new FileStream(tiff2inputFilePath, FileMode.Open, FileAccess.Read, FileShare.Read);
                numberOfPages = getNumberOfPages(tiff2inputFilePath);
                for (int i = 0; i < numberOfPages; i++)
                    sourceBitmap.Dispose();
                    byteStream.Close();
                    byteStream.Dispose();
                    sourceBitmap = (System.Drawing.Bitmap)getTifPage(imageStreamSource, i, out byteStream);
                    sourceBitmap.Save(byteStream, System.Drawing.Imaging.ImageFormat.Tiff);
                    System.Drawing.Bitmap tmpOutputBitmap = (System.Drawing.Bitmap)System.Drawing.Image.FromStream(byteStream);
                    outputBitmap.SaveAdd(tmpOutputBitmap, encoderParams);
                //Finally flush the file:
                saveEncodeParam = new System.Drawing.Imaging.EncoderParameter(System.Drawing.Imaging.Encoder.SaveFlag, (long)System.Drawing.Imaging.EncoderValue.Flush);
                encoderParams = new System.Drawing.Imaging.EncoderParameters(1);
                encoderParams.Param[0] = saveEncodeParam;
                outputBitmap.SaveAdd(encoderParams);
            finally
                imageStreamSource.Close();
                imageStreamSource.Dispose();

Answer 1

I solved the problem. The following code works also on 2003 and 2008.
public void appendTiffs(string tiff1inputFilePath, string tiff2inputFilePath, string outputFilePath)
            FileStream fileStream = new FileStream(tiff1inputFilePath, FileMode.Open, FileAccess.Read);
            ImageCodecInfo tiffCodecInfo = getEncoder(ImageFormat.Tiff);
            Encoder saveEncoder;
            Encoder compressionEncoder;
            EncoderParameter saveEncodeParam;
            EncoderParameter compressionEncodeParam;
            EncoderParameters encoderParams = new EncoderParameters(2);
            saveEncoder = Encoder.SaveFlag;
            compressionEncoder = Encoder.Compression;
            saveEncodeParam = new EncoderParameter(saveEncoder, (long)EncoderValue.MultiFrame);
            compressionEncodeParam = new EncoderParameter(compressionEncoder, (long)EncoderValue.CompressionLZW);
            encoderParams.Param[0] = compressionEncodeParam;
            encoderParams.Param[1] = saveEncodeParam;
            FileStream outputStream = new FileStream(outputFilePath, FileMode.Create, FileAccess.ReadWrite);
            Image image = Image.FromStream(fileStream);
            image.Save(outputStream, tiffCodecInfo, encoderParams);
            fileStream.Close();
            fileStream = new FileStream(tiff1inputFilePath, FileMode.Open, FileAccess.Read);
            saveEncodeParam = new EncoderParameter(saveEncoder, (long)EncoderValue.FrameDimensionPage);
            compressionEncodeParam = new EncoderParameter(compressionEncoder, (long)EncoderValue.CompressionLZW);
            encoderParams.Param[0] = compressionEncodeParam;
            encoderParams.Param[1] = saveEncodeParam;
            TiffBitmapDecoder tiffBitmapDecoder = new TiffBitmapDecoder(fileStream, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default);
            TiffBitmapEncoder tiffBitmapEncoder;
            int numberOfPages = tiffBitmapDecoder.Frames.Count;
            for (int i = 1; i < numberOfPages; i++)
                BitmapFrame frame = tiffBitmapDecoder.Frames[i];
                System.Drawing.Bitmap bitmap;
                using (MemoryStream outStream = new MemoryStream())
                    tiffBitmapEncoder = new TiffBitmapEncoder();
                    tiffBitmapEncoder.Frames.Add(frame);
                    tiffBitmapEncoder.Save(outStream);
                    bitmap = new System.Drawing.Bitmap(outStream);
                    image.SaveAdd(bitmap, encoderParams);
            fileStream.Close();
            fileStream = new FileStream(tiff2inputFilePath, FileMode.Open, FileAccess.Read);
            tiffBitmapDecoder = new TiffBitmapDecoder(fileStream, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default);
            numberOfPages = tiffBitmapDecoder.Frames.Count;
            for (int i = 0; i < numberOfPages; i++)
                BitmapFrame frame = tiffBitmapDecoder.Frames[i];
                System.Drawing.Bitmap bitmap;
                using (MemoryStream outStream = new MemoryStream())
                    tiffBitmapEncoder = new TiffBitmapEncoder();
                    tiffBitmapEncoder.Frames.Add(frame);
                    tiffBitmapEncoder.Save(outStream);
                    bitmap = new System.Drawing.Bitmap(outStream);
                    image.SaveAdd(bitmap, encoderParams);
            fileStream.Close();
            saveEncodeParam = new EncoderParameter(saveEncoder, (long)EncoderValue.Flush);
            encoderParams.Param[0] = saveEncodeParam;
            image.SaveAdd(encoderParams);
            outputStream.Close();
        private ImageCodecInfo getEncoder(ImageFormat format)
            ImageCodecInfo[] codecs = ImageCodecInfo.GetImageDecoders();
            foreach (ImageCodecInfo codec in codecs)
                if (codec.FormatID == format.Guid)
                    return codec;
            return null;