Are Microsoft, Sun & Yahoo! employees keener to defend their products than Apple & Google's?

The Scobleizer blog, in this post entitled “Microsoft fights for its reputation, where’s Apple and Google?”, brings to light the fact that Microsofties are keener to engage a conversation defending their products than employees from Apple and Google. I know very few people at Microsoft, all in Seattle, and one at Apple in Les Ulis, in the Paris outskirts, and from my own experience, the Scobleizer’s stance looks like true. The case of Google is more complex: Google top executives put so much energy in keeping everything it does secretive that I couldn’t picture its employees go out of the wood and fight.
What’s your opinion on this matter? Do you know companies whose employees are willing to get into the mud to preserve their reputation? Do you think such a behavior is good or evil for a brand?
Addendum October 11th 2006: Scobleizer again on Apple anonymous bloggers. I recommend that you take a look at the comments too, pretty interesting.
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