Just curious

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http://www.linuxquestions.org – I posted a question on June 9 regarding an old laptop with 512 mb ram and running a version of Linux on it. I got several suggestions (thank you). Just was curious..nobody mentioned older versions of Linux..such as RH 7.2, 7.3 etc...looking at specs, they are fairly low, and wondering why nobody thinks that those are viable options? To be honest...there are soooo many different Linux distros, that I am fairly confused as to what might be a good option. I have heard of RH thru the years so I know its been around a long time.. I could try all the suggestions...but really dont want to install/rei (HowTos)