Depends on the point of view, as it is Apple not supporting that MacBook anymore, and Microsoft could have a point in not supporting macOS versions that Apple doesn't want to support anymore. You could even argue that he forced the update on himself, since the web version still worked. The point remains that somehow without upgrading the hardware some software he uses everyday doesn't work anymore.
Depends on the point of view, as it is Apple not supporting that MacBook anymore, and Microsoft could have a point in not supporting macOS versions that Apple doesn't want to support anymore. You could even argue that he forced the update on himself, since the web version still worked. The point remains that somehow without upgrading the hardware some software he uses everyday doesn't work anymore.