VMware vSphere v.5.0 Essentials

 I purchased VMware vSphere v.5.0 Essentials (for 3 Host Max - 2 CPU Per Host) in one customer site.
 Currently there are two VMware hosts (ESXi V5.5) on the network and I am setting up a 3rd VMware host(Server box). Actually there used to a 3rd VMware host (that I used to use for testing). I removed that host from the network as I no longer needed it.

 I like to use ESXi 6.1 on the new Host.
 My questions are:
 (1) Since I am allowed to use the license for 3 hosts, can I install ESXi 6.1 on the new host and enter the license number that came with VMware vSphere v.5.0 Essentials (part# VS5-ESSL-BUN-C) or do I have to purchase  vSphere V6 Essentials (Part#: VS6-ESSL-KIT-C)?
 (2) Since I removed the 3rd host (for testing), am I ok to apply the license on my new VMware Host? Does VMware keep track of how many times I applied license number on different hosts?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
vSphere 5.x licenses will not work with 6.0.

Remember, that you will need to be using vCenter 6.x, to manage your ESXi 5.x and 6.x hosts, vCenter 5.5 cannot manage 6.x ESXi hosts.

So this will require

1. vCenter 5.5 to vCenter 6.0 upgrade.
2. vCenter 6.0 licenses.

If you have valid Support and Subscription, you will be entitled to update you current licenses to 6.0, BUT all your licenses will then be 6.0, so you will need yo update your hosts from 5.5 to 6.0.

So in answer to

1. Not as easily as that, so no not really.

2. Yes, you can re-use that license. But it will only be valid for 5.5

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sgleeAuthor Commented:
What would be the benefit of getting vCenter 6.0 vs  5.5? Perhaps would I have a hard time installing Windows 10 or Windows 2012 R2 or Windows 2016 (when it becomes available) as VM on V5.5 host?
Since I have vCenter 5.5 running without a problem, I would like to keep V5.5 hosts as they are unless there is a compelling reason.
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
You have no choice, if you need to manage ESXi 6.x hosts! They need to be managed with vCenter 6.0.

So the benefit of vCenter 6.0 and ESXi 6.0, is the approx 480 new features that exist with vSphere 6.0!

You said I would like to use ESXi 6.x, as the new host, you can but you'll need to upgrade you vCenter Server it's not compatible with ESXi 6.0.
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