The "Microsoft Tax" is often cheaper than the "Linux Engineering Salary." While Linux alternatives exist, they require "assembly"—integrating LDAP, Kerberos, DNS, and config management (Ansible/Salt) to do what AD does out of the box.

Most businesses don't want to be in the business of maintaining their own identity infrastructure. They want a utility. Between Group Policy’s granular control over the endpoint and the tight integration with Exchange/M365, Microsoft has created a "sticky" ecosystem. I've tried the "DIY" route with Linux mail servers, and the friction of maintaining deliverability and security patches manually is a nightmare compared to the "it just works" nature of the Microsoft ecosystem.

I am not a system admin, so maybe this is a crappy take.

M365 and Azure run on the NT kernel. This blog post makes zero sense.

This guy is in for a disappointing future since he seems to be unaware that Windows is more than than the consumer editions. Revenue from Windows Enterprise (which has management tools like Active Directory and backwards compatibility with non-game apps needed for large corporate deployments) and Windows Server (needed for Active Directory, Exchange, SQL Server, etc.) is still in the billions and there's nothing on the horizon in the Linux ecosystem to replace those. Given that Microsoft is going to have to continue to develop Windows anyway, there's not much reason for them to throw in the towel on the consumer desktop.