Ok let me propose a hypothetical to you all....
Lets say you are in your late 30s to early 40s and youre the IT Director of a Fortune 500 Corporation.
You have thousands of servers around the world with countless data bases. You have offices every where from Boston to Budapest with hundreds of computers in each office. Not to mention the many retail locals that have a varying array of printing hardware, software and customer data that needs to be supported. You also have hundreds of flight hubs at which you need to move packages fast and can not afford a glitch.
At each of these locations you have people who have the intelligence of a Princeton Physics Professor. You also have people who are lucky if they tie their shoes correctly in the morning.
You also have an army of IT personal that rivals that of present day China. They are equipped with cells phones and pdas that have more bells and whistles than you can shake a stick at. They also have a combined IQ of 1,695,365,487.8 and they understand Slack ware Linux.
And you Boss, the CEO who has a wrath that would rival that of Stalin asked you to overall the network plus you have to make it secure, reliable, and you have squeeze ever bit of performance out of it.
So what do you choose Mac or Windows?
Macs are built on rock solid UNIX technology. They have some of the best hardware and that performs flawlessly under just about any condition. With MacOS X you can support a wide range of hardware and software. You also have the option to use Open Source software. Plus its more secure then Fort Knox at Defcon 1.
Windows is built on a base that has more holes then Swiss cheese. It can support a wide variety of hardware and software but with varying degrees of success (but mostly negative). Using Open Source software is almost out of the question. So you mine has well just give the hackers the dam password to the super secret security system.
I think the answers clear.
The only reason FedEx is saying its just a rumor is that the IT Director is too busy building a shire to Steve Jobs and switching the network over Macs to get a quote.