Just be aware that when using older versions of MS Office, you may come up against file compatibility issues, either opening them yourself, or people trying to open files from you. Not really an issue if you're just doing basic stuff locally, but something to be aware of regardless.
I work in IT and only the other week we had a customer wondering why they couldn't open an Office '97 Access database on 365. To be fair, it did open, but was an absolute mess.