Compatibility issues of IE7

Hi,

I had been using Internet Explorer to access my official webmail –
Microsoft? Office Outlook? Web Access
for Exchange Server 2003

I have been facing a problem, since I was unable to compose mails. I am unable to type content on the body of the mail. Therefore, I downloaded avant browser, but I am facing the same problem in avant browser also.

Though, I am not facung this problem with Mozilla firefox, it lacks a lot of other features like RTF.

My PC details are: Windows vista home premium OS, Microsoft Office 2007 small business edition, McAfee security centre antivirus.

I would be glad if you could provide me solution.

Regards
Rajesh