When right-clicking on the Word icon in Crossover, you choose "Run with options" and then let Crossover create a log file for the execution of the Word.exe: It gives a whole list of library files that are needed for the Office programs to function correctly. I installed all of the libraries mentioned there (at least the ones that were available in openSUSE) and now all Office programs start up normally with usable interfaces. Only thing that is still not working is "online stuff" (i.e. adding a mail account to Outlook, etc).