As Microsoft moves to offer software-as-a-service with Windows Live, online companies are moving to challenge Microsoft on the desktop. In a decision that would have been seen as foolish a few years ago, file sharing and social networking company TransMedia plans to release desktop productivity apps (in conjunction with online ones) as lightweight Microsoft Office alternatives. Google, meanwhile, through its deal with Intuit, is colonizing desktop apps as it has done with browsers and search toolbars. Microsoft used to have a home field advantage on the desktop, thanks to Windows. Lately, operating system ownership is looking a lot less valuable.
The short answer is "no", but it is a qualified "no" because there are odd ways of interpreting the question which could justify the answer "yes". Light is composed of photons so we could ask if the photon has mass. The answer is then definitely "no": The photon is a massless particle. According to theory it has energy and momentum but no mass and this is confirmed by experiment to within strict limits. Even before it was known that light is composed of photons it was known that light carries momentum and will exert a pressure on a surface. This is not evidence that it has mass since momentum can exist without mass. [ For details see the Physics FAQ article What is the mass of the photon? ]. Sometimes people like to say that the photon does have mass because a photon has energy E = hf where h is Planck's constant and f is the frequency of the photon. Energy, they say, is equivalent to mass according to Einstein's famous formula E = m
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