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It looks a lot like VMware just lost a 24,000-VM customer • The Register
(www.theregister.com)
This is a most excellent place for technology news and articles.
I wouldn't be afraid to use Proxmox for small and middle size business. It's solid and based on solid, opensource tech. As long as people make sure they get paid, I'm sure they'll get even better.
Good on you for making sure your clients pay for support, that's how opensource thrives.