Amy Bennett writes "A recent poll of about 12,000 US business decision-makers by market researcher CoreBrand found that Microsoft's brand power has taken a dive over the past four years. According to the study, Microsoft dropped from number 12 in the ranking of the most powerful US company brands in 2004 to number 59 last year. In 1996, the company ranked number 1 in brand power among 1,200 top companies in about 50 industries. The CEO of CoreBrand said: 'When you see something decline with increasing velocity, it's a concern.' To add some historical context, IBM suffered a much faster and more severe decline in brand power in the early 1990s and it took them 10 years to rebuild the brand's reputation."