Determine if you have the Enterprise Edition of Office XP

Only Enterprise Editions of Office XP CD's contain a folder called ORK.

Retail and OEM Windows Installer .MSI packages contain ret. Examples: proret.msi, sberet.msi.

Trial Windows Installer .MSI packages contain tri. Example: protri.msi

Enterprise Windows Installer .MSI packages do not contain ret or tri. Examples: pro.msi, proplus.msi.