Why Can't I Use Laptops in 24/7 Server Environment?

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http://serverfault.com – I've built an Internet service that's going to handle a few hundred simultaneous users. It'll run smoothly on a grid of VMWare+Windows 2008 servers. Why can't I use laptops instead of traditional towers and rack-mountable servers for my hardware infrastructure? No one ever does this. I'm sure there's a good reason for it. But what is it? The laptops have the 1gb ethernet, enough ram, enough storage, and enough cpu power to do the job. Is it an overheating issue? Are laptops just not meant to be on for 24/7 under heavy load? What will happen to them under heavy load? I'd ideally like to sti (HowTos)