Internet Explorer 8 stopped working

Internet Explorer 8 stopped working

Yesterday my IE8 users ~30 could not get their Zoho mail. My FireFox users ~25 were all good.
 A box with 'Loading...' is all that displayed in the middle frame of my IE8 users.
A javascript error at the lower left read the details of..

Message: Script error
Line: 0
Char: 0
Code: 0
URI: https://js.zohostatic.com/zmail/v257/javascript/zmm.js

Can you tell me what I need to do to get these working?