Start by reading this first:
http://download.microsoft.com/download/d/e/6/de6ecad4-2c5f-4eef-bbe4-cd2f267177e4/FINAL%20-%20Windows%20Small%20Business%20Server%202008%20Release%20Candidate%20Reviewer’s%20Guide.docx
Download details: Windows SBS 2008:
http://www.microsoft.com/downloads/details.aspx?familyid=5c4e9dea-ab34-40f6-8c73-bd94051331b4&displaylang=en&tm
Download the RC0 from there
Designed for small businesses, Windows Small Business Server 2008 is an affordable, integrated server solution that helps you protect your business data, increase productivity and present a more professional image to customers – giving you the tools you need to help grow your business capacity.Windows Small Business Server 2008 Technical Library:
http://technet.microsoft.com/en-us/library/cc527559.aspx
Windows Small Business Server TechCenter:
http://technet.microsoft.com/en-us/sbs/default.aspx
Yup got a red security… no a/v yet on the vmware Vista.