Was waiting for being called on that
Actually these were nlite created custom install images I did for the family members for their old systems. Do work reasonably well for reading wikipedia and doing some word 97. My point is: debian testing doesn't do even these simple tasks on comparably old hardware. Recent network manager alone will eat 64MB before the rest of the DE has even started (which will take ages because of the much lower I/O bandwidth on old systems). And pretty much any desktop environment now available has gimmicks like showing window content while dragging/resizing as default which is really horrible on any older card that was not high end then or that doesn't have very good driver support (and around 0% of old graphics cards have good driver support on recent X).
I'm not really proposing to use XP, but it *is* from 2003 and is (just like old Linux distributions) much more adequate for equally old hardware than anything released (be it FLOSS, MS, Apple, whatever) in the last couple of years. On an old system any recentish combination of OS+DE will be less responsive than a fresh XP installation.