Anyone who wants people to stop using Windows-based systems needs to deliver applications which will do what people need to do at least as well as the Windows-based systems they are already using.
Slight flaw in your logic. People buy orifice. Wordpad would suit most of them just as well. Even opens office docs.
In addition, the new applications MUST be able to read the existing data; users are not going to re-enter all their data unless they have a very good reason indeed.
And how often has changes to office (etc) broken such things?