Not that I do a bunch of Office development, but I did build a pretty nifty utility for PowerPoint a while back. Getting it installed on anyone elses machine, however, was a pain in the ass because while I always remember to install the Office Primary Interop Assemblies when I install Office, I'm fairly certain I'm in the minorty on doing so. So installing Build Slide Exporter was alway tricky. Now, the Office PIA's are available as a seperate install. Not sure if you can redist them, but the readme file that comes with the installer specifically mentions "Wrap the O2003pia.msi in another setup package through Visual Studio or other Windows Installer aware setup editor" so it sounds like they expect it to be redistributed.