Firefox OK, Not working w/Expl 7

Firefox OK, Not working w/Expl 7

I prefer to use Explorer 7 with my e-mail as I have in the past, but since the update today it is not responding - can't compose, can't open e-mail, can't mark and move e-mails, etc, etc..  Will Zoho Mail be working again on Explorer 7?  Is there anything I need to do to make this happen?