I was reading this article about Microsoft's top-execs frowning on people in the company using iPhones. Ballmer & Turner were gung-ho for using MS products in the face of obvious deficiencies.
I can't imagine many people, even at Microsoft, think any of the Windows Mobile phone range is actually better than an iPhone or, say, a Nexus One. Does Ballmer still stand by that $99 Motorola Q-phone.
Rather than being hostile to employees using iPhones. Rather than aping destroying an employee's iPhone. Why not encourage people to use the best and ask why that isn't Microsoft's product.
Surely it's much more powerful for Ballmer & Turner to use an iPhone and turn round to their employees and say "Why? Why is the CEO of Microsoft having to carry around an iPhone? Do better."