Can you explain more please, because if you have Windows 7 then you cannot have Outlook Express as your email client. So you must have a different email client, I wonder if you are confusing it with the new Hotmail which is now Outlook.com
Outlook Express was/is the email client program on a pc that came with XP and W98 op systems.
Outlook.com is the new renamed Hotmail and is Webmail and not a program on your pc. You access it via your browser (IE10 or firefox or whatever browser you use)
Or maybe you have Microsoft Office and are using the Office program called Outlook?