RoaringApps - App compatibility and feature support for OS X & iOS

The same for me, Mac Pro (early 2009) and ATI Radeon 4870. Works perfect without any problems on OS X 10.8 Mountain Lion.

Installing Snow Leopard onto an external HD - I partitioned mine first, about 20GB are more than enough for a SL install (I use 50GB, just to be safe) - is much easier and faster to use than the way using VirtualBox.
I made a disk image from my Mac OS X 10.6 Install DVD and used Disk Utility to restore this image to an USB stick. With booting from this stick it took me about 15 minutes to install SL onto my external HD - including prior preparation of my external HD.
Handy when You intend to play older games other than Warcraft III as well.
On Lion, everything works fine for me when playing the game btw.

After a new install on Lion, download and install Microsoft AutoUpdate 2.3.2 and all updates can be installed through the auto update application again:

http://www.macupdate.com/app/mac/16437/microsoft-autoupdate