reddit

“
Barth used data provided by users to Devil Mountain's Exo.performance.network — which it kicked off last year and has expanded by partnering with InfoWorld, a Computerworld sister publication — to come up with his numbers. By collating such things as the vendor and system model number with manufacturers' catalogs, Barth was able to identify machines that were probably shipped within the past six months, a period when virtually every new PC was offered with Vista preinstalled.
” source...