In the world according to Microsoft, mature technologies are defined as those for which Microsoft is shipping products. Any other technology is by definition immature.
If you keep that thought in the back of your head, this interview with Mike Neil, Microsoft's general manager for virtualization, becomes hilarious.
His core points: Microsoft isn't behind VMware because server virtualization is still a developing market and confined to (unnamed) niche markets. Only Microsoft can give virtualization an appeal to a "wider swath of the industry".
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