Apple spent much effort in making the Mac Pro power efficient, drawing at most 450W. And, I would guess far less on average. If you're paying about 11 cents, per kWh and using it 8 hours a day, at most it's going to cost you about $144. With all the fans and other things in a typical PC, I have to imagine that it would be possible to double or triple the annual power consumption costs of the Mac Pro.

If I had a time machine that could take me back to 1899, I don't think my newly acquired smarts would help me in getting into Harvard. Oh well. -Josh

"Now businesses can run Microsoft Outlook on Google Apps instead of Microsoft Exchange, so they can achieve the cost savings, security and reliability of Google Apps while employees use the interface they prefer for email, contacts and calendar." http://www.google.com/apps/intl/en/business/outlook_sync.html You just have to cough-up some cash for the Premier Edition.