So, why not before?
So, why in heaven's name hasn't this been done before? Since the inception of Windows NT windows has had the capability to run tasks in a virtual environment - the old DOS box and Windows on Windows subsystems managed that trick.
Both Internet explorer and Outlook ought to join Firefox in the sandbox along with a quarantine instance for passing, and inspecting attachments and downloads so that they cannot auto-run,. and are inspected before arriving on your nice clean machine.
