That's bullshit. What Microsoft did is bundle Office with all computers, at no cost. They used their monopoly position in operating systems to crush wordprocessing and spreadsheet companies by bundling a free alternative that would read the competitor's file formats. Competitors, with no other source of revenue, died. Once they were dead, Office was no longer free.

This is a classic example of how a company with a monopoly position in one product uses that power to create a monopoly position in other products.