VERSION 1.7.0.0

 <CompressorTask
        CssFiles="@(CssFiles)"
        DeleteCssFiles="false"
        CssOutputFile="$(CssOutputFile)"
        CssCompressionType="YuiStockCompression"
        JavaScriptCompressionType="YuiStockCompression"
        JavaScriptFiles="@(JavaScriptFiles)"
        ObfuscateJavaScript="True"
        PreserveAllSemicolons="False"
        DisableOptimizations="Nope"
        EncodingType="UTF8"
        DeleteJavaScriptFiles="false"
        LineBreakPosition="-1"
        JavaScriptOutputFile="$(JavaScriptOutputFile)"
        LoggingType="ALittleBit"
        ThreadCulture="en-gb"
        IsEvalIgnored="false"
 />

C:\Users\Patrick>C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe C:\Projekte\XYZ\MSBuild\yui-compress.xml
Microsoft (R) Build Engine Version 4.0.30319.1
[Microsoft .NET Framework, Version 4.0.30319.269]
Copyright (C) Microsoft Corporation 2007. All rights reserved.

Build started 01.11.2012 11:21:43.
Project "C:\Projekte\XYZ\yui-compress.xml" on node 1 (default targets).
MyTaskTarget:
  Starting Css/Javascript compression...
  Using version 1.7.0.0 of YUI Compressor .NET Library MsBuild Task.
  Current thread culture / UI culture (before modifying, if requested): German (Germany)/German (Germany)

  # Found one or more JavaScript file arguments. Now parsing ...
      ** Obfuscate Javascript: Yep!
      ** Preserve semi colons: Nope :(
      ** Disable optimizations: Hell No!
      ** Line break position: None
      ** Thread Culture: English (United Kingdom)
  # 80 JavaScript files requested.
      => ..\Scripts\external\010.jquery.tmpl.min.js
      => ..\Scripts\external\015.knockout.debug.js
     ...
      => ..\Scripts\knockout\user_profileViewModel.js
      Finished compressing all 80 files.
  Total original JavaScript file size: 758800. After compression: 308628. Compressed down to 40.67317% of original size.
  Compressed content saved to file [..\Scripts\final-js.js].

  Finished Css/Javascript compression.
  Reverted back to thread culture / UI culture: German (Germany)/German (Germany)
  Total time to execute task: 00:00:01.5640878
  8< ---------------------------------  ( o Y o )  --------------------------------- >8

Done Building Project "C:\Projekte\XYZ\MSBuild\yui-compress.xml" (default targets).

Build succeeded.
    0 Warning(s)
    0 Error(s)

Time Elapsed 00:00:01.66


-------------------------------------------------------------------------------------
VERSION 2.1.1.0

 <JavaScriptCompressorTask
            SourceFiles="@(JavaScriptFiles)"
            DeleteSourceFiles="false"
            OutputFile="..\Scripts\final-js.js"
 />

C:\Users\Patrick>C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe C:\Projekte\XYZ\MSBuild\yui-compress_new.xml
Microsoft (R) Build Engine Version 4.0.30319.1
[Microsoft .NET Framework, Version 4.0.30319.269]
Copyright (C) Microsoft Corporation 2007. All rights reserved.

Build started 01.11.2012 11:26:43.
Project "C:\Projekte\XYZ\MSBuild\yui-compress_new.xml" on node 1 (default targets).
Minimize:
  No logging argument defined. Defaulting to 'Info'.
  No Compression type defined. Defaulting to 'Standard'.
  Starting Compression...
  Using version 2.1.1.0 of YUI Compressor .NET Library MsBuild Task.
  Current thread culture / UI culture (before modifying, if requested): German (Germany)/German (Germany)

  # 80 files requested.
      => ..\Scripts\external\010.jquery.tmpl.min.js
      => ..\Scripts\external\015.knockout.debug.js
      ...
      => ..\Scripts\knockout\user_profileViewModel.js
      Finished compressing all 80 files.
  Total original file size: 758804. After compression: 308663. Compressed down to 40.67757% of original size.
  Compression Type: Standard.
  Compressed content saved to file [..\Scripts\final-js.js].

  Finished compression.
  Total time to execute task: 00:00:38.1757334
  8< ---------------------------------  ( o Y o )  --------------------------------- >8

Done Building Project "C:\Projekte\XYZ\MSBuild\yui-compress_new.xml" (default targets).

Build succeeded.
    0 Warning(s)
    0 Error(s)

Time Elapsed 00:00:38.40