I'm installing a test network in preparation for rolling out new versions of software in the office. It's running Win 2003r2.

I am a little short of hardware - one of my old servers just isn't up to the job, but I'm reluctant to go and buy any new kit as it's only really needed for about a month.

But, I do have an old G5 powermac (single 1.8) sitting around, and I'm wondering if I can use that. All it needs to do is behave like a Windows ISA server, which is firewall and proxy services.

Any idea if it's worth the trouble? Suggestions what to use?