Why distrust M$, but trust Sun?

On Jul 27, 1:27 pm, Tim Smith <reply_in_gr....DeleteThis@mouse-potato.com> wrote:
> On 2007-07-27, Alexander Terekhov <terek....DeleteThis@web.de> wrote:
>
> >> It's still managed by people from Sun, and they contribute most of the
> >> code.
>
> > More to the point:
>
> >http://contributing.openoffice.org/programming.html
>
> Yup. It's interesting how many self-proclaimed open source advocates
> don't seem to actually know anything about what they advocate, other
> than that it isn't Microsoft and it isn't Apple.

How is what is described on that page _not_ open source?