In article , Franz Heymann
writes

Ah, well, I am running Windows 98 and have no intention of upgrading.
Do you really mean that later versions have newly introduced vulnerabilities
which did not exist on the older versions?

Yes. Firstly, newer versions of Windows have additional features, which
provides additional opportunities for security holes. Secondly, it's
well known that fixing bugs results in the introduction of new bugs;
after enough work the number of bugs reaches a steady state. Thirdly,
any reimplementation, e.g. to speed up the s/w or make maintenance
easier, may introduce bugs.
--
Stewart Robert Hinsley