If you’re having trouble putting Microsoft Office 2008 on your new Snow Leopard (OS 10.6) Mac, it may be because you need to install Rosetta, the PowerPC emulator that allows you to run older software that was not designed to run on Intel Macs.
As it turns out, while Office 2008 is completely universal (that is to say, it will work with both PowerPC and Intel Macs), the installer is written only for PowerPC. If you put the disk in your computer without Rosetta, you will probably receive a message about it not being compliant, or you may not see the disk at all. If this happens, simply insert the Snow Leopard disk, and add Rosetta. Then re-insert the Office disk and it should prompt you to use Rosetta to run the installer.