The VMware vSphere 4 Essentials Edition which includes VMware vCenter and Update Manager (VUM), supports up to 3 ESX/ESXi hosts each with up to 2 CPUs and with no more than 6 cores per processor. Each virtual machine can have up to 4 vCPUs. The promotion, valid till June 15, includes 1 year software subscription but no support. This lowers the entry price of vSphere to 405 and its probably one of the most aggressive moves ever taken by VMware to win the SMB market
