How what?How ?
As I said, electronic mail on the internet is something entirely different to the WWW aka HTML. One has nothing to do with the other, and e-mail did exist long before and independent from the WWW.
Now if people insist that they want to use a service that provides their e-mail on a web-page, that they want to use a service that can open within their browser some spreadsheets attached to an e-mail by just clicking on them, that they want to use a service that will open any URL inserted into an e-mail (or a spreadsheet) within their browser by simpliy clicking on it, then that is their business that equates their business.
BTW, the same goes for viruses. By design an OS cannot get viruses. There is only one thing that is malconstructed and poses as an OS, that can get viruses, and that is called microsoft windows. I do not understand why anyone in the world would use such. I for my part did dump MS-DOS in 1990, because already then it failed to properly function.
Now I cannot solve people's problems, because I do not even understand why they have these problems (or why they are doing what they are doing), in the first place. I can only state that I do not have these problems, and can explain what I am doing - but that does typically only yield me negative reputation.