a little update: i managed to slipstream the SP1 updates in the MUI packs. It the same process as for Office 2003. You have to create an administrative installation with the /a switch and the integrate the SP1 packs for each language you want (in my case French, German, Spanish and Italian) Now i'm stuck, i don't know how to include them all in the Office 2003 CD and create a DVD with the whole thing.