Depending on what your constraints are, you might consider Ubuntu Linux (or some other flavor of linux) and Libre Office - which has the advantage of being free and being generally compatible with MS Office. It always takes a few months to catch up with the latest version, but to my mind that's a small price to pay for not being indentured to MS. And I say that as a former MS employee of several years. And the backwards compatibility is generally better than what you get with the newer version of office.

Oh, hey, it even runs on Windows, so you don't have to install Linux.

https://www.libreoffice.org/download/