Hi mara & others. In first place, sorry for my english, im spanish and not very used to write it. I have been messing around office 2003 these past days, and i have encountered the same error manually or with your software. Maybe you can help me. I have both, Retal and VLK versions of Office 2003 Profesional SPANISH. (Lets put the Retail apart). On DIY process, using VLK, i made setup.exe /a for admin install Im asked to put key and data...i configured to "install/extract" on D:\office, use key XXXXX-... and all that stuff Meanwhile, i extract SP3 doing something like Office2003SP3-KB923618-FullFile-ESN.exe /q /c /t:D:\temp After both ended, i tried to integrate with msiexec /p D:\temp\MAINSP3.msp /a D:\office\PRO11.msi SHORTFILENAMES=TRUE /qb msiexec /p D:\temp\OWC11SP3.msp /a D:\office\OWC11.MSI SHORTFILENAMES=TRUE /qb Integration runs perfectly and MSIs & EXE are modified. Its similar whats your software does. Apart from that, i use this integrated installation to create a MST witn ORK to put the same key, packackes to install... But after burning it to an ISO, during install it request for original CD. Any idea? PS: Spanish version for your app. uploaded spanish.zip