eXtra Pain
eXtra Processor
eXtra Pathetic
eXpand PC
eXplode PC
eXtremely Proprietary
eX Paperclip (they got rid of it at last)
eXponential Pricing
eXPensive
eXPired
eXtra Problems
linuX-Promoting
eXtacy Pill
eXtra Payment
eXPerimental
eXtra Profits
eXtremely unPredictable
Xenophobic Programming
eXtended Protocols
eXcentric Programming
10th Pre-beta
eXcremental Pile
eXclude Pirates (that was the plan, anyway)
Xmas Party
eXPloitation
eXtra Pillow (useful for when you're waiting for it to boot)
The real answer, however, was revealed by Bill Gates at the Windows XP launch in New York where Regis Philbin staged a mock-up of his famous "Who Wants to be a Millionaire" and asked Mr. Gates what the XP stood for. (originally seen
here)
REGIS PHILBIN: Bill Gates, what does the XP in Windows XP stand for? Is it extreme power, expediency, experience, supercalifragilistic-XP-alidocious?
BILL GATES: Well, itÂ’s a pretty easy one. I think IÂ’ll go with C.
REGIS PHILBIN: Experience? You say experience, final answer?
BILL GATES: Final answer.
REGIS PHILBIN: All right. And youÂ’re right. Bill Gates, youÂ’ve just won a hundred dollars.