But note that pdflib is NOT open source, it is source available, but not free or open in the classic sense of the word.
That said, it is a mature, well thought out product, and at $500 for a commercial license (and then only if you SELL pdfs with it, i.e. if you provide docs in pdf as a support function with no charge it's still free) it's hard to beat.
But I switched from NT to Linux 2 years ago because of the dearth of good programs like this under windows.