Index: src/main/java/hudson/plugins/warnings/parser/MsBuildParser.java
===================================================================
--- src/main/java/hudson/plugins/warnings/parser/MsBuildParser.java	(revision 12233)
+++ src/main/java/hudson/plugins/warnings/parser/MsBuildParser.java	(working copy)
@@ -13,7 +13,7 @@
     /** Warning type of this parser. */
     static final String WARNING_TYPE = "MSBuild";
     /** Pattern of MSBuild compiler warnings. */
-    private static final String MS_BUILD_WARNING_PATTERN = "(.*)\\((\\d*).*\\)\\s*:\\s*(warning|error)\\s*([^:]*):\\s*(.*)";
+    private static final String MS_BUILD_WARNING_PATTERN = "(.*)\\((\\d*).*\\)\\s*:\\s*(warning|error|Warning|Error)\\s*([^:]*):\\s*(.*)";
 
     /**
      * Creates a new instance of <code>MsBuildParser</code>.
Index: src/test/java/hudson/plugins/warnings/parser/MsBuildParserTest.java
===================================================================
--- src/test/java/hudson/plugins/warnings/parser/MsBuildParserTest.java	(revision 12233)
+++ src/test/java/hudson/plugins/warnings/parser/MsBuildParserTest.java	(working copy)
@@ -5,6 +5,7 @@
 import hudson.plugins.warnings.util.model.Priority;
 
 import java.io.IOException;
+import java.io.StringBufferInputStream;
 import java.util.Collection;
 import java.util.Iterator;
 
@@ -52,5 +53,40 @@
                 "MediaPortal.cs",
                 MsBuildParser.WARNING_TYPE, "CS0162", Priority.NORMAL);
     }
+
+    /**
+     * MSBuildParser should also detect keywords 'Warning' and 'Error', as they are
+     * produced by the .NET-2.0 compiler of VS2005
+     *
+     * @throws IOException
+     *
+     * @see <a href="https://hudson.dev.java.net/issues/show_bug.cgi?id=2383">Issue 2383</a>
+     */
+    @Test
+    public void shouldDetectKeywordsInRegexCaseInsensitive() throws IOException {
+        StringBuilder testData = new StringBuilder();
+        testData.append("Src\\Parser\\CSharp\\cs.ATG (2242,17):  Warning CS0168: The variable 'type' is declared but never used");
+        testData.append("\r\n");
+        testData.append("C:\\Src\\Parser\\CSharp\\file.cs (10): Error XXX: An error occurred");
+
+        Collection<FileAnnotation> warnings = new MsBuildParser().parse(new StringBufferInputStream(testData.toString()));
+
+        assertEquals("Wrong number of warnings detected.", 2, warnings.size());
+
+        Iterator<FileAnnotation> iterator = warnings.iterator();
+        FileAnnotation annotation = iterator.next();
+        checkWarning(annotation,
+                2242,
+                "The variable 'type' is declared but never used",
+                "Src/Parser/CSharp/cs.ATG",
+                MsBuildParser.WARNING_TYPE, "CS0168", Priority.NORMAL);
+        annotation = iterator.next();
+        checkWarning(annotation,
+                10,
+                "An error occurred",
+                "C:/Src/Parser/CSharp/file.cs",
+                MsBuildParser.WARNING_TYPE, "XXX", Priority.HIGH);
+
+    }
 }