One of the first things you will configure in vCenter Server is
VMware vSphere 4 has a number of great improvements and additional features.
Upgrading vCenter is the first step in getting your virtual infrastructure ready to be able to take advantage of these.
vCenter must be upgraded first, before adding any ESX/ESXi 4 hosts. ESX 3.5 hosts can be added to vCenter 4. However ESX 4 hosts cannot be added to vCenter 2.5.
1. Login to the VMware license portal to check/upgrade/buy your vSphere licenses.
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