Index: wp-settings.php
===================================================================
--- wp-settings.php	(revision 11568)
+++ wp-settings.php	(working copy)
@@ -61,7 +61,7 @@
 	$blog_id = 1;
 
 // Fix for IIS, which doesn't set REQUEST_URI
-if ( empty( $_SERVER['REQUEST_URI'] ) ) {
+if ( strpos($_SERVER['SERVER_SOFTWARE'], 'Microsoft-IIS') !== false || empty( $_SERVER['REQUEST_URI'] ) ) {
 
 	// IIS Mod-Rewrite
 	if (isset($_SERVER['HTTP_X_ORIGINAL_URL'])) {