In March this year, Microsoft announced of discontinuation of the future development of Windows Essential Business Server. To help customers with this transition, Microsoft made available at no cost the EBS Migration Kit.
"EBS Migration Kit includes 3 licenses of Windows Server 2008 Standard, 2 licenses of Exchange Server 2007 Standard, and System Center Essentials 2007 (with 10 Server Management licenses and 50 Client Management licenses). The kit is available for a limited time, from June 30th, 2010 through December 31st, 2010. Following December 31st, the EBS Migration Kit will no longer be offered and customers who wish to move to the individual products will need to purchase them through traditional channels. Customers who acquire the EBS Migration Kit today don't need to migrate out of the suite immediately."
Customers can acquire the EBS Migration Kit until December 31st through a simple online order process here.