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Microsoft once tried to cut Windows 11 RAM usage, install size by 20%, now it’s trying again in 2026
(www.windowslatest.com)
This is a most excellent place for technology news and articles.
It worked well with just 64MB of RAM
https://en.wikipedia.org/wiki/Windows_Fundamentals_for_Legacy_PCs
So they easily can get the memory footprint down to the floor
A thin client? Sure, you can get it down that far if you don't want to run anything but the remote desktop software.