Web Interface of IE only is not woking

[prasadpimple]

hi

MY zimbra server working fine when users are trying to login on web interface firefox its work fine on both ajax & html
but instead of firefox when i am trying to used IE 6 or 7 then in ajax it get stuck up after login not mail box screen get diaplay only loading .........
but when i am trying to login using IE wirth html its get logged in but interface
is not getting displayed in proper way

i had tried by cleanning up cache , also tried from other system its not working


any body has faced such issue

please reply asap