It's generous of Microsoft to have released the excellent Mathematics 4.0 software for free. It's a commendable contribution to students and also the broader education/mathematics/scientific community. I downloaded the software as well as all the associated documents [PDFs, etc.] yesterday, and I thought, why not make the entire package I downloaded available to everyone, sparing them the effort to download each file individually :).
You can download the entire package from this SkyDrive link. The screenshot below shows the contents of the archive: