There's a little heat between Apple and Microsoft right now, with Bill Gates slamming Apple's 'Get A Mac' ads as not offering a "shred of truth".

Gates was speaking to Newsweek. He was arguing against the Apple ad which shows the PC going into surgery for an upgrade. Gates insists Microsoft has "done a better job letting you upgrade on the hardware than our competitors have done".

Gates also takes the opportunity to deny that Vista is no more than a pale imitation of Mac OS X. The Microsoft founder even offers a few laughs when he points to the Month of Apple Bugs project and its discovery of a selection of relatively minor and quickly patched anomalies in Mac OS X and third-party applications.

"Nowadays, security guys break the Mac every single day. Every single day, they come out with a total exploit, your machine can be taken over totally. I dare anybody to do that once a month on the Windows machine," Gates claims.

Gates also charges in to argue against Apple's superior user interface: "Do you want to go back to the original Mac and think about where those interface concepts came from?" he asks.

Gates also takes a moment to tell Newsweek that the next version of Windows after Vista will be "more user-centric".

Gates also offers his sales pitch for Vista, stressing its new Sidebar, built-in search, parental controls and capacity to edit images and movies and burn DVDs. Many of these features may sound pretty familiar to Mac users living the iLife.

You can read Newsweek's full interview here.