_ghassen_ wrote:
but the tiff logo is not large enougth.
Which is why it's probably important to contact Microsoft directly and ask for what you need. It's likely that they don't provide them for a reason and by telling them what you plan to do, they may make them available to you, although they may require that you submit your design to them for approval before you go ahead with it. That's what many of the agencies I deal with make us do when we use their logos. Cheers, Drew.