Index: program/js/app.js
===================================================================
--- program/js/app.js	(revision 76248c7b6e5060107536de2c4e287667b02b3b0e)
+++ program/js/app.js	(revision d960a01bb472dc6ce022681bc0ab636a102a1e18)
@@ -1854,6 +1854,9 @@
         html = expando;
       else if (c == 'subject') {
-        if (bw.ie)
+        if (bw.ie) {
           col.onmouseover = function() { rcube_webmail.long_subject_title_ie(this, message.depth+1); };
+          if (bw.ie8)
+            tree = '<span></span>' + tree; // #1487821
+        }
         html = tree + cols[c];
       }