It's the right thing to do, for Microsoft. Their users aren't going to leave them, no matter what, so why waste money on QA staff and testing? It's better for

It's the right thing to do, for Microsoft. Their users aren't going to leave them, no matter what, so why waste money on QA staff and testing? It's better for the company's profit margin to just let the users deal with those problems, and the users agree since they're happy to keep using MS products and paying for them.