Sorry for the very long delay, finally, the last part (Part 5 of 5) was to provide knowledge on the http://www.GOTUC.net website and how it can help you get started with Microsoft Exchange 2010 and Unified Communications, please check out:http://gotuc.net/blogs/gotuc/archive/2009/03/26/office-communications-server-2007-r2-vhd-now-available.aspx
GOTUC.net is a group of Microsoft Office Communications Server developers working together through a web-community to promote Office Communications Server development, to increase our skills and assist others. The founders of this site are firm believers in the potential of OCS and are committed to doing our part to make this community grow.
On this site you will find many Microsoft MVPs for OCS who are willing to share their expertise with others. They are big evangelists for OCS and seek every available opportunity to speak out about it.
I want to send a special thanks to Keith Kabza for all of his knowledge sharing around OCS in this series.
PS, I'll be contributing to the System Center pages soon, so look for me there!