Hi, over the past 20 years, I bought two different versions of Office. Whenever I changed machines, I used TimeMachine. When I got the MBP 16" 2019, I had two working versions of Office on it. No problem. Then, I worked at a school which uses Office (I think it is Office 365 version as when I used them on a PC or iPad Pro, the software used my school's email address for verification I guess). I don't recall installing new version of Office to my MBP. Now I no longer work there and my email address has expired. Whenever I launch programs such as Words or Excel, I cannot save documents. When I checked the program, my product ID contains a bunch of zeros. It shows my former school's email address and a device ID. Did Office automatically converted from my two old versions to Office 365? What can I do to use full features of Office? The older versions I bought in the past are sufficiently good enough for my use.