Index: wp-admin/tools.php
===================================================================
--- wp-admin/tools.php	(revision 17358)
+++ wp-admin/tools.php	(working copy)
@@ -45,7 +45,10 @@
 if ( current_user_can($cats->cap->manage_terms) || current_user_can($tags->cap->manage_terms) ) : ?>
 <div class="tool-box">
     <h3 class="title"><?php _e( 'Categories and Tags Converter' ) ?></h3>
-    <p><?php printf( __('<a href="%s">Use this</a> to convert categories to tags or tags to categories.'), 'import.php' ); ?></p>
+<?php
+	$cat2taglink = is_plugin_active( 'wpcat2tag-importer/wpcat2tag-importer.php' ) ? admin_url( 'admin.php?import=wpcat2tag' ) : admin_url( 'import.php' );
+    printf( '<p>' . __('<a href="%s">Use this</a> to convert categories to tags or tags to categories.'), $cat2taglink ). '<p>';
+?>
 </div>
 <?php
 endif;