Yes, your right. I'm aware of that.
It should be a company-logo - not an standard icon fitting on the app like a invoice-document or anything like that. Many developers use their standard application icon, but Microsoft shows how to use the AppButton: They don't use extra icons for Excel, Word or Powerpoint. They use their MS-logo. And I don't have a own logo by now
By the way, Phil: I still haven't found a way to display bigger icons on the AppButton like I asked for in my last post in the following thread: