Since we live in the era of digital development, there will be security gaps regardless of the operating systems used by each state. Certainly microsoft is not the best possible solution to security issues but let us not forget that operating systems such as linux are also exposed to risks from time to time. Let's not forget also the xz utils backdoor that was recently discovered and for three years no one understood what was going on.

My personal opinion is that operating systems like OpenBSD are the most secure solution for servers, firewall, router, mailserver, webserver, hypervisors, nas and desktops. Check here https://openbsd.org https://openbsdjumpstart.org