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When I try and add a host which is on ESX 3i 3.5.0 to VCenter I get the message <br />
&quot;VI3 hosts cannot be added if vCener is licensed but License Server is not configured. Configure License Server and try again.&quot;<br />
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Firstly I am not sure how to do that, or if it will work.<br />
Secondly, I have 2 VI3 hosts I want to add to the V4 vCenter, but they are both old HP ML350 G3's which won't support v4 but I'm still hopping to be able to use them for a while including vMotion at some point - is it ok to mix?
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When I try and add a host which is on ESX 3i 3.5.0 to VCenter I get the message 
"VI3 hosts cannot be added if vCener is licensed but License Server is not configured. Configure License Server and try again."

Firstly I am not sure how to do that, or if it will work.
Secondly, I have 2 VI3 hosts I want to add to the V4 vCenter, but they are both old HP ML350 G3's which won't support v4 but I'm still hopping to be able to use them for a while including vMotion at some point - is it ok to mix?

Adding VMWare ESX 3i s.5.0 Hosts to VSphere 4 VCenter

VMware, a software company founded in 1998,  was one of the first commercially successful companies to offer x86 virtualization. The storage company EMC purchased VMware in 1994. Dell Technologies acquired EMC in 2016. VMware’s parent company is now Dell Technologies.

VMware has many software products that run on desktops, Microsoft Windows, Linux, and macOS, which allows the virtualizing of the x86 architecture.  Its enterprise software hypervisor for servers, VMware vSphere Hypervisor (ESXi), is a bare-metal hypervisor that runs directly on the server hardware and does not require an additional underlying operating system.