Note: I am sticking w/ an OS I have learned to control over the past few years - XP. Plus, my demands on an OS are minimal now. I have written umpteen programs back in the day, and used so many products including Office for so many purposes over my academic and engineering career, and now only need a few lite weight things. The low vision controls of XP and FF browser (plus nice ad/track block extensions) do it well. My 10 y/o single core AMD in an HP box is ready to browse in 50 sec from a restart, and 20 sec from hibernate. If it had quieter fans, I'd just leave it on.
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All that said, the posts here on this thread and elsewhere on the www about how to 'upgrade' to W7 or W8 do not address my interests, or those of many like me, who have just what we need in XP.
But they do raise an interesting point about pricing, and I will only look at a single scenario - that of a software upgrade to W7.
The thing you are paying for is the manufacturer's support (MS) for an OS for a specified calendar time epoch - 2009 to 2020 for W7, I think. So if you 'upgrade' XP to W7 today, you only get about 1/2 of the support built-in to the original price for a copy of W7.
Whatever happened to prorated value?