Even though Bill Gates is no longer the CEO of Microsoft, he and his family are still attached to the legacy of products that he helped bring to the market are the company that he founded.
One of Bill's new focuses is with his wife in work on the Bill & Melinda Gates Foundation. The New York Times had a chance to briefly talk with Melinda Gates, and one of the topics she was asked about was whether or not Apple products exist inside the Gates' household. In a word, the answer is a stern "No." Here's the entire exchange:
Do you own an iPod, which is made by Apple? No, I have a Zune. What if one of your children says, “Mom, I have to have an iPod?” I have gotten that argument — “You may have a Zune.” Do you have an iPad? Of course not. Is it true that Bill works on an Apple laptop? False. Nothing crosses the threshold of our doorstep. Isn’t there room in this world for both Apple and Microsoft? Microsoft certainly makes products for the Macintosh. Go talk to Bill.
We don't expect there to be any Windows PC products inside Steve Jobs' home, so this isn't all that surprising.