Anti-Virus software and a Firewall are absolutely essential in order to avoid having your computer system hacked, disabled, or worse. There are a variety of sources these attacks can originate from, such as web pages, usb sticks floppy disks, compact discs and e-mail attachments.
So, after just setting up my home home office server, and opting for Windows Server 2003. Yes I know I should probably have played with something like Ubuntu Server - but I had a licensed version of Server2003 and as I'm specifically interested in playing with Microsoft BizTalk it kind of made sense.
Even tho server is fairly robust and I wont be surfing much I always like the peace of mind of running an antivirus application on any system thats windows based or has gaping great big flag waving 'hack me please' applications like Internet Exploder on them. My personal favourite is AVG anti-virus but it doesnt install on Windows Server 2003. Aaaargh!!!!!
However, help was at hand because I found a great free opensource version called Clamwin. ClamWin is an open source product and so is completely free. It has no active scan. Combine it with Winpooch Watchdog which adds an active antivirus scan using ClamWin's internal virus definitions and you can have a decent anti-virus running on your server.
From the CLAMWIN website: