Hi Lawrence, The short answer is, I don't know. What I would suggest is that you post the question in the Beta Forum, and hopefully someone from the team will see it and respond. Alternatively, you could just apply on the Beta Site, explaining your situation, and see what happens. You do get the opportunity to test on multiple devices under your own subscription, but I'm not sure if that would extend to ten machines. Talk to them, and I'm sure they will be helpful. Bear in mind, though, that with beta products, there can be the occasional drama, so you may want to consider whether you want to install a beta version on a 'mission critical' device. That said, I've been a beta tester for about three years now, or maybe more, and I've not had that many major problems.
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