Index: Adapter/Sqlsrv.php
===================================================================
--- Adapter/Sqlsrv.php	(revision 21196)
+++ Adapter/Sqlsrv.php	(working copy)
@@ -314,7 +314,7 @@
             return sprintf('%F', $value);
         }
 
-        return "'" . str_replace("'", "''", $value) . "'";
+        return "N'" . str_replace("'", "''", $value) . "'";
     }
 
     /**
Index: Statement.php
===================================================================
--- Statement.php	(revision 21196)
+++ Statement.php	(working copy)
@@ -190,21 +190,23 @@
         // get the character for value quoting
         // this should be '
         $q = $this->_adapter->quote('a');
-        $q = $q[0];
+        preg_match('/^(.*)a(.*)$/', $q, $matches);
+        $qStart = $matches[1];
+        $qEnd = $matches[2];
 
         // get the value used as an escaped quote,
         // e.g. \' or ''
-        $qe = $this->_adapter->quote($q);
-        $qe = substr($qe, 1, 2);
+        $qe = $this->_adapter->quote($qEnd);
+        $qe = substr($qe, strlen($qStart), (-1)*strlen($qEnd));
         $qe = str_replace('\\', '\\\\', $qe);
 
         // get a version of the SQL statement with all quoted
         // values and delimited identifiers stripped out
         // remove "foo\"bar"
-        $sql = preg_replace("/$q($qe|\\\\{2}|[^$q])*$q/", '', $sql);
+        $sql = preg_replace("/$qStart($qe|\\\\{2}|[^$qEnd])*$qEnd/", '', $sql);
         // remove 'foo\'bar'
         if (!empty($q)) {
-            $sql = preg_replace("/$q($qe|[^$q])*$q/", '', $sql);
+            $sql = preg_replace("/$qStart($qe|[^$qEnd])*$qEnd/", '', $sql);
         }
 
         return $sql;