You can purchase the Microsoft apps , would, excel, PowerPoint, as a package that you own. There are no upgrades. You own them.

I am in the process of moving to Linux and Libreoffice at the moment. I’m working at getting myself off of Onedrive at the moment.

Once complete I will start the process of getting off Google. I’ve been using Proton for years and I am going to remove any other online support.