This. Plus M$ was firmly against open source and open standards for most of it's existence. They only switched to open XML based file formats after some EU muni

This. Plus M$ was firmly against open source and open standards for most of it's existence. They only switched to open XML based file formats after some EU municipalities experimented with switching to open source software rightly arguing that they have no effective way to preserve or convert vital files in proprietary formats. M$ wouldn't have done it otherwise. Microsoft, like most corporations, only does the right thing when it coincidentally benefits them.