And was never. The Personal-Computer is an original product of International Business Machines (IBM) and not Microsoft. Contrary to most products shipped today it's architecture is open for industry standards and other companies. A huge success for IBM.
Microsoft shipped the pre-installed and required operating-system. You can order desktops and laptops without an operating-sytem or Linux from Lenovo (former IBM), Dell, System76, Purism, Tuxedo and many more. Vendors which aim for cheap distribution to private customers usually only ship Personal Computers with Windows. Most of these are crap and come with questionable pre-installed software - and I don't refer to Windows.
That IBM sold the PC subsidiary was the worst mistake the could ever have done, both Apple and Lenovo show how much money you can earn with long lasting high quality products. IBM lost the contact point to many customers. They need to succeed with Red Hat now. Irony, IBM use and prefer (again) ThinkPads, preinstalled with Linux.
If you say "it runs on PC" you're actually saying your software is compatible to an Intel 286 CPU or higher. Well, if it is portable?