What browser are you using? Can you right-click on the MAIL icon/link and select 'open in new window/tab'? Or, right-click and copy the link address and then create a new shortcut on your desktop with that link address in the properties.
Assuming you're using Windows. Right click on the email icon on the home page, and choose open in new window. Or right click on your browser's icon on the task bar and choose from there.