We upgrade our cluster's vCenter from 4.1 to 5.1 standard recently. But all the hosts are still in ESXi 4.1U1. Everything works so far. The hosts are still using the vSphere 4.1 Enterprise Plus license we have. I just want to understand what kind the limitation we will have with such deploy. What's the main difference between a vCenter 5.1 cluster with ESXi 4.1 hosts and ESXi 5.1 hosts?
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