Index: wp-admin/user-edit.php
===================================================================
--- wp-admin/user-edit.php	(revision 45093)
+++ wp-admin/user-edit.php	(working copy)
@@ -417,7 +417,7 @@
 			?>
 <tr class="user-super-admin-wrap"><th><?php _e( 'Super Admin' ); ?></th>
 <td>
-			<?php if ( $profileuser->user_email != get_site_option( 'admin_email' ) || ! is_super_admin( $profileuser->ID ) ) : ?>
+			<?php if ( 0 !== strcasecmp( $profileuser->user_email, get_site_option( 'admin_email' ) ) || ! is_super_admin( $profileuser->ID ) ) : ?>
 <p><label><input type="checkbox" id="super_admin" name="super_admin"<?php checked( is_super_admin( $profileuser->ID ) ); ?> /> <?php _e( 'Grant this user super admin privileges for the Network.' ); ?></label></p>
 <?php else : ?>
 <p><?php _e( 'Super admin privileges cannot be removed because this user has the network admin email.' ); ?></p>