In November 2010, OKES IT Consulting Services successfully implemented VMWare Server on Ubuntu Server 10.4 LTS in order to virtualise Universal Services Access Agency of South Africa's entire Microsoft server environment.  At the same time, we completed the upgrade of their Active Directory from 2003 to 2008, replaced their MS Exchange 2003 server with Exchange Server 2010 as well as replaced their SQL 2000 server with SQL 2008.  All this was achieved in 2 weeks from start to finish with absolutely no downtime of any systems!