Bug #253339 --> Remove old program files when installing on top of an existing installation

mail/installer/windows/mail.jst

@@ -504,6 +504,7 @@ function upgradeCleanup()
   deleteThisFile("Components",  "pipnss.dll");
   deleteThisFile("Components",  "pippki.dll");
   deleteThisFile("Components",  "profile.dll");
+  deleteThisFile("Components",  "profilemigration.dll");
   deleteThisFile("Components",  "rdf.dll");
   deleteThisFile("Components",  "txmgr.dll");
   deleteThisFile("Components",  "uconv.dll");