Because they can't speculate about this at work, or on a company-approved internal forum? MS is notorious in disallowing criticism of itself internally.

Hell, I've even heard of people being asked to refrain from inviting coworkers to "Wii parties" via company mailing list.

Why would Microsoft disallow criticism internally? Isn't that the one place where you want criticism?

I wouldn't find it surprising if they did. Think of it from the companies stand point. If employees are bitching about salaries, working conditions, etc... All that does is serve to get the entire work force all hot and bothered about it. It's not like we're talking about debating the merits of UI design in their products.

As an employee, I assure you that we are fully allowed to criticize the company internally.