Vista Hands On #9: Use Vista for four months, free by ZDNet's Ed Bott -- Looking for real Windows Vista secrets? Everyone knows you can install Windows Vista in evaluation mode for 30 days and reset the countdown timer three times, giving you a free evaluation period of 120 days. The trouble is, you have to remember to type the magic command every 30 days or you're deactivated. Unless you know the real secret, which uses another Windows feature to automate the process. I've got the never-before-published details here.