Uninstall Leopard from new Mac Pro

Got a brand spankin new Mac Pro at work which was thrilling until it became obvious that nothing works with Leopard (which is what came on the Mac). Too many of our vital apps won't work with Leopard (read Adobe CS2) and the boss isn't prepared to update everything to be compatible with Leopard, plus it's not even possible to update some of them.
So what is the least painful way to get Tiger on this computer?
We don't own an external drive.

Hello,
Unless you have a copy of Tiger for Intel, you cannot do it. The "off the shelf" version of tiger is for the PowerPC. If you can get ahold of a Mac Pro Tiger reinstall DVD set, then you could try to do an erase and install of tiger. I am not sure if you are going to see any issues or not with Tiger on the new hardware. I would guess not, but you never know.
Ebay might be a good place to look for a mac pro reinstall dvd.
Just pop in the dvd, press and hold "C" before the computer chimes and it should boot to the CD, after that it is as easy as apple.

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