Microsoft 365 means Microsoft Online, according to the translator. And it makes sense: they are positioning Office as their core product, not just one of many products. They are renaming Microsoft Office to just Microsoft; this is the online version (which happens to be the only version); and it has AI, which they are prominently showcasing. Hence, Microsoft 365 Copilot. It means "Microsoft Online, now with AI"

Of course, all of this is completely retarded.