Summary: No operating system. I made a mistake purchasing this, I'd done a search for a powerful Windows 8 computer with Intel I7, and there was one choice, so I bought it. I didn't check this listing carefully enough.
Great server for the price and Computer Upgrade King was ...
Amazon's Best Customer, Amazon
1 August 2015
Summary: Great server for the price and Computer Upgrade King was great to work with. While I was initially disappointed that one of the sticks of RAM was bad when it arrived. Computer Upgrade King quickly diagnosed the problem and shipped me out replacement RAM which I received in two days.
Summary: As others have noted, it is quite loud upon initial start up but quiets down. The boot up time is very long before getting to Windows but this may be a matter of fiddling with some BIOS settings.
Summary: Very happy with this server. Great performance. Good quality and construction. I was going to buy another one, but see that the price just went up from 399 to 499. I'm hoping it drops back down to the old price so I can pick up another one.