Migrating infrastructure to Microsoft Windows

Afternoon,

I submitted a proposal to change our unix infrasturcture to windows. This
is basically a windows show and I think the users will be more happy
with a windows infrastructure. My question is does anyone know of a
case study, list of steps, books, etc that show how someone has done this
before? I have an idea of the steps I want to execute to get from unix
to windows, but I would like to have the wisdome of some elses success
(or mistakes not to make . I will be converting three existing Server
2003 machines to Server 2008 R2 hyper-v instances.

I will be coverting from -> to:

OpenLDAP AD
Cyrus Exchange
Samba Windows file share
unix bind Windows implementation
Google Calendar Exchange
Google Talk Microsoft IM?

Other suggestions? Thank you.

Mike