only fools pay
It's safe to assume that businesses participating in Home Use program have already assigned e3 license to employees. This entitles to bunch of installs across devices of users' choice. Let's call it sideloading (someone paid for it so freeloading it is not). Keep files locally and Office is Office. For honest folks or these that simply don't trust MS, there are open source options. And obviously old versions of MSO (regardless of their license status). Absolutely no reason for consumers to fill up MS coffers.
Biting the hand that feeds IT
