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Best way is to bring up the new vCenter, Get all the settings right. <br />
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Backup all the custom information you want to keep about the VMs your running (custom notes generally). You can do this with powershell and export it all into a CSV.<br />
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Move one of your hosts in with a few dev/test VMs to make sure everything is working, then bring the rest of the hosts across.<br />
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Restore all your custom data and your done.
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Thanks for the input gentlemen.... I agree with Andrew, probably too much effort to stay with 6.0. Especially considering my reason not to go to 6.5 is reluctance to move away from the vSphere VI Client (Desktop) completely, I've always felt it still has its uses and so much simpler to navigate than the web client. Guess it is time though... LOL
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I have an environment running vCenter Server for Windows 6.0. I am not ready to move up to 6.5 yet. I just want to get off the Windows version o6.0 and on to the vCSA 6.0. The migration tool does not support this... is there a way to do this? Possibly deploying the vCSA, joining it to the existing SSO domain as a secondary vCenter and decommissioning the old?
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I have an environment running vCenter Server for Windows 6.0. I am not ready to move up to 6.5 yet. I just want to get off the Windows version o6.0 and on to the vCSA 6.0. The migration tool does not support this... is there a way to do this? Possibly deploying the vCSA, joining it to the existing SSO domain as a secondary vCenter and decommissioning the old?

vCenter for Windows 6.0 to vCSA 6.0

This topic area includes legacy versions of Windows prior to Windows 2000: Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions including Windows Mobile.

Windows OS

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.