Anti-Virus when using Tiger and Vista

I am considering upgrading to a Macintosh Notebook and will want to run Mac OS and Microsoft Vista. If this is the wrong forum, I apology. I will be using Micrsoft Office 2007 Professional as well. The one question that I need answered is "Do I need to have a separate anti-virus program for each OS?
Thank you for your assistance.

I'll disagree with this. While a true Mac OS X virus has not been written yet Mac users should not be complacent. And antivirus should never be thought of as protecting just the Mac user but also protecting other users by preventing the spread of viruses.
Anyone remember the AutoStart Worm?
History tells of Mac OS 9 users being complacent (I was) and then the AutoStart Worm or Hong Kong virus hit Macs hard. This virus caused sluggish performance for Macs and destroyed files. It spread using a QuickTime vulnerability to execute its code any time a disk was inserted into a machine. Particularly scary was that some versions of this worm destroyed graphics files back when Macs were the overwhelmingly dominant platform in the Desktop Publishing industry. Nothing could have been targeted better. It's because of this worm that Apple will no longer offer the ability to automatically run an application when a CD is inserted (Windows still does). For more information have a look at <http://www.macintouch.com/hkvirus.html>.
Protect yourself and your partner!
Sound familiar? Another reason to use antivirus is to help protect others. All decent antivirus applications for Macs also detect Windows viruses and macro viruses that can be spread through executables or Office documents. If you pass along a virus-infected file to a Windows user even though your Mac is immune then you're doing a disservice to the community. And remember, you're not passing along the virus just to another computer but to every other computer that person transfers files with.
Don't do unto others what others have done unto you!
They're called viruses for a reason and your Mac will not be immune to everything. I urge you to practice safe computing. You'll especially understand this if your own computer has ever been infected.
bill
1 GHz Powerbook G4 Mac OS X (10.4.8)

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