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Andrew,<br />
I have 3 host with ESX 4 and one brand new server.<br />
So I was going to install ESXi 5.5 on the new server, then create a new Vctr on it, then migrate the vms from one of the 3 ESX 4 host to the new ESXi 5.5 host and then just do a fresh install of ESXi 5.5 on the old host, and then do the same for the other 2 ESX 4 host.<br />
Then I would upgrade the VMware tools on the vms brought over and the update their hardware...<br />
Does this sound good?
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Andrew,
I have 3 host with ESX 4 and one brand new server.
So I was going to install ESXi 5.5 on the new server, then create a new Vctr on it, then migrate the vms from one of the 3 ESX 4 host to the new ESXi 5.5 host and then just do a fresh install of ESXi 5.5 on the old host, and then do the same for the other 2 ESX 4 host.
Then I would upgrade the VMware tools on the vms brought over and the update their hardware...
Does this sound good?

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Yes, standard simple practice.
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Build new vm host with ESXi 5.5
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Is it possible to upgrade from ESX 4 to ESXi 5.5 and if so, is there a good document with the steps forupgrading the host and the Vctr?
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Is it possible to upgrade from ESX 4 to ESXi 5.5 and if so, is there a good document with the steps forupgrading the host and the Vctr?

Can I upgrade from ESX 4 to ESXi 5.5

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.