How are they an enemy?
https://en.wikipedia.org/wiki/Criticism_of_Microsoft
What surprises me is that the tech crowd is so ready to bend over for one of the worst companies on the planet in the software domain. These are the very same people that abused the legal system in every way that they could in order to slow down the adoption rate of open source. They are still doing this today but quietly, for instance by incentivizing municipalities and other government layers to use their software (for free if necessary) just to stop adoption of equivalent open source solutions.
What specifically?
I'm not trying to be difficult, but linking to a lengthy Wikipedia page is not an argument. From a quick glance a number are old, and a number are just non-issues (e.g. "Mono patent concerns", which was just some baseless FUD mentioned by Stallman once almost 15 years ago), but I didn't read the entire page. "Incentivizing municipalities and other government layers to use their software" could just be normal business practice (or something shady – much depends on the details).