You can’t do whatever you want if you’re an employee in a big enterprise, there are company-wide rules and standards that you have to respect, you can’t expect your colleagues to adapt to you nor you can decide which OS to install on your company PC.
That’s not to say you can’t use Linux at all, you can ask your IT to be allowed to install Virtualbox and use Linux in a VM, that’s what I do, there are a lot of things that don’t strictly require Windows and I use Linux for those.