I’ve been using the same copy of Microsoft Office 2003 since I got it with the laptop I bought for myself that year. When I went to college, I would send the papers I wrote on my laptop to library computers to be printed. The library at my college had a much better budget than I did, though, so they had the latest microsoft office version, meaning I got so used to seeing “File Name [compatability mode]” at the top of all my documents that I eventually stopped noticing it unless I wound up editing a file started on the library computers on my personal laptop.