ISC bind -vs- Microsoft implementation of bind.

Hi, I have been responsible for our dns at where I work for years.
We started out using a Vax running Multinet and have migrated to
Linux using ISC's bind. I have been asked to justify using bind and
why we don't move over to Microsoft. I have looked on the net
and the only discussions I see look more like religious wars, I was
hoping to find something a little more technical. I have used Microsoft
in the past and have had problems. Of course, working at a large
company, they would rather hear it from someone else. Can someone
point me to some technical comparisons between the two....thanks
in advance.

-Dennis Leiterman