On the 23rd December you must present this email in-store to get 50% off all purchases as it's for VIP members only.
Boxing Day Sale - 50% off all purchases in-store 26/12/2010 and 27/12/2010 (depending on which store you go to).
You do not need to present the email on the 26th/27th.
See the following link for participating stores and days/hours
http://shop.guess.net.au/www/615/1001172/displayarticle/1642…
It doesn't say online anywhere…does it?