So???
Windows 8 is a consumer-oriented operating system and it is not significantly faster than Windows 7. There is no compelling reason for the enterprise to upgrade its systems outside of its normal lifecycle upgrade schedules. Which means that, in any given year, the enterprise will replace between 20% and 33% of its computer hardware. Few enterprise-class business will fall outside a three-to-five year lifecycle so your 74% figure is just about where we should expect it to be.
For 2012-13, most enterprise customers who buy hardware pre-loaded with Windows 8 will downgrade to their standard Windows 7 build. A few of those new machines will be left with Windows 8 installed for testing purposes and, in a few month, the IT department will do a thorough evaluation and start developing a "test" build for Windows 8 in order to determine how they might benefit from an upgrade. In a year to eighteen months, I think you can expect that those numbers to be reverse
