It is a good thing, a very good thing. Most users care about applications, not the underlying OS. If you get them using Firefox, Thunderbird and OOo on Windows, they will find the transition to Linux so much easier.
Even if they stick with Windows, anything that reduces the stranglehold of vendor lock-in has to be a good thing.
"Insanity: doing the same thing over and over again and expecting different results." (Albert Einstein)