If I use the newest Firefox 4 or the Preview Internet Explorer 10 I receive errors in the SurgeWeb Mail Login page that SurgeWeb support newer browsers ! and that AJAX will not work..

Should I change some settings in the latest browsers or is an upgrade for SurgeMail or/and SurgeWeb available ?

My version;
Surgemail SurgeMail Version 5.0e4-4, Built Sep 9 2010 13:51:53, Platform Windows