When I bought my powermac g4 for the home, it came with Tiger installed on it (and of course with no licensed disc). When I contacted the seller to ask what disk he used to install Tiger, he responded with "a legitimate version of the OS". While I have been using Tiger without problems, I have been concerned that the version he installed was a P2P or beta version, so I went ahead and ordered a legit version of the OS from Apple (only $69 with the academic discount). BTW, Ilife and Iwork are even less than that with the academic discount too! Am I being OCD about having a copy of Tiger from Apple installed on my mac? Should I be concerned about the authenticity of the original install? Should I try to upgrade my OS with the legit version from Apple and how can I do it? Any thoughts are much appreciated.