"I should probably say it's an exciting thing to finally be here — and that's all I'll say about the past," Ballmer said, before adding: "This is the biggest launch in our company's history, that's for sure."

Businesses that buy Windows licenses in bulk have first crack at PCs with the new operating system or at upgrade discs for installing Vista on existing machines. Consumers won't be able to get Vista on home PCs until Jan. 30.

Analysts expect slow adoption of the new operating system as businesses test it for compatibility with their programs or wait for Microsoft to work out any kinks that may exist in the first release.
 

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