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The end of Windows 10 is approaching, so it's time to consider Linux and LibreOffice
(blog.documentfoundation.org)
This is a most excellent place for technology news and articles.
What is the highest spec pc I am likely to find for sale when people realise it cant go to windows 11?
Unless the requirements have changed, you’re looking at 2016-2017 era. Intel 7000-series, AMD Ryzen 1000-series. Newer may be available if there’s no TPM installed.
TMP 2.0 released in October 2014, so I don't think that you can find particularly powerful systems up for grabs.
I had a look and it looks like you will not get anything special. The cutoff is around 2015. So for example Lenovo T440s will support Win11 but T440p will not. Looking at backmarket T440s is cheaper than T440p. So looks like you will only be able to get something ancient and the price will be pretty standard.