I heard that Windows 7 has a 120 day trial option. How does this work? If Vista is anything to go by, I imagine that one installs it from the disk, with no key, and it works in trial mode for 120 days. If you then buy it, you simply put your key in and it activates. Am I right? Some concerns: Is the trial fully functional, or is it crippled? Can one install the trial from an RTM disk? Has anyone here tried out the trial? I want to see it before I buy it.