Hey! That's weird! I logged in here 1/2 hour after you to ask exactly the same question!
PS Seems this question has been asked a lot on other hosting forums too. Apparently you have to log in as a defined user, not default account, and a spam box will only appear after a period if there actually is any spam. Log into Cpanel, webmail, then logout at top right, log in as specific defined user xxx@myco.com then set up squirrel spam box as here
http://support.summersault.com/faq/1_69_en.htmlEven if that works for you (have forwarded some spam to myself and still can't find it anywhere) having to check different spam boxes for each user each day hardly seems worth it, may as well rely on one's own PC's antispam to detect it in Live Mail. Also, don't forget to set the default address as most spam is to unknown users at myco and will go there. Find Popcorn is good for viewing that, avoids stuff in your main mail client.