Index: maven-core/src/bin/mvn
===================================================================
--- maven-core/src/bin/mvn	(revision 356626)
+++ maven-core/src/bin/mvn	(working copy)
@@ -29,8 +29,10 @@
 # OS specific support.  $var _must_ be set to either true or false.
 cygwin=false;
 darwin=false;
+mingw=false
 case "`uname`" in
   CYGWIN*) cygwin=true ;;
+  MINGW*) mingw=true;;
   Darwin*) darwin=true 
            if [ -z "$JAVA_VERSION" ] ; then
              JAVA_VERSION="CurrentJDK"
@@ -88,6 +90,15 @@
     CLASSPATH=`cygpath --path --unix "$CLASSPATH"`
 fi
 
+# For Migwn, ensure paths are in UNIX format before anything is touched
+if $mingw ; then
+  [ -n "$M2_HOME" ] &&
+    M2_HOME="`(cd "$M2_HOME"; pwd)`"
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME="`(cd "$JAVA_HOME"; pwd)`"
+  # TODO classpath?
+fi
+
 if [ -z "$JAVACMD" ] ; then
   if [ -n "$JAVA_HOME"  ] ; then
     if [ -x "$JAVA_HOME/jre/sh/java" ] ; then