I am a very new poster here so forgive me if my question is stupid or naive, just tell me to go read more. My question / thought..... I know traditionally when new software like an O/S is released there is new hardware released at the same time, (as is the case with the new Airs). At this point BIOS type code is often added to stop them running older code or OS. I work in the industry (as sorts) and initially tried calling a few Apple and specialised stores and then AppleCare to get an answer. With no real success I then tried a few other people who's knowledge I trust,; still no real straightfoward yes/no. The collective (paraphrased) answer across my investigation seems to be "maybe". It would bot be hard to block old code running but in engineering terms that is usually reserved for reasons of protecting the hardware from code that could cause physical harm or allow spec that you arent paying for I have a MBP 15" 2.2 coming this week, my first OS X powered device. I work with server grade stuff at a low level (planar firmware, Device Driver and low level code), this does not make the learning curve for me to OS X necessarily easier than anyone else. I just like the way OS X works and have wanted one for ages. It is a birthday present to myself for my 40th birthday in September 9th; I will be on vacation then so I HAD to get it early to check it all works OK I could not care if it is loaded with Lion or SN, if SN then ideal. If Lion I would like to try SN for a bit of fun but it is not the end of the world if it is just can't be done. I have been looking at the OS X discs on eBay (UK) and they seem new and genuine, even on the Apple store it is is £26 so not something I would loose sleep over. The marketing reasons for blocking a code is another bucket of worms I don't want to delve into. Unless some of you know the answer to this question I do not expect a resolution from this thread. I guess in the end for me it is a £26 gamble I take if I but on the Apple Store or perhaps less if I go the eBay route. Does anyone think I am kidding myself on and should just get used to LION as a non SN user with no baggage of "Why doesn't it do it this way?!!!" and enjoy Lion. This is not going to be business critical machine, it is a personal machine that I have already a 2TB Time Capsule waiting to plug into so hopefully covered the bases (just add CCC for bootable backup). Cheers, Martin.