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Have you heard of this thing called Linux?
sure have, but most offices are still running Windows, but feel free to to subtract the $500 software fee, and double the install time unless you have a tech that is really on the ball (and more expensive). And also double price because windows tech are a dime a dozen, Linux/Unix guys tend to make more money. And the tech will still need to make at least 2 trips to the desk a year for hardware and networking problems.
Even with the reduction in costs the $200 computer still costs closer to $500.
with the sun ray techs only need to visit the users desk for setup and total hardware failure since there are no user configurable parts on the sun ray its just set and forget as far as the tech goes and no hard drive or fans to die.