You're off topic for this forum, which is dedicated to Windows Live OneCare.
However, what you *really* want to do is stop using Windows Mail and download and install Windows Live Mail from http://get.live.com
This will allow you to have all of the functionality of Windows Mail in Vista *plus* the ability to access your Windows Live Hotmail account.
You can manually forward messages from your Hotmail account to your Sympatico account, which I assume is a POP account. You cannot forward to an account automatically unless you have a paid Windows Live Hotmail account.
-steve