> but then again who actually pays for Linux apps?
Despite this oft repeated statement, I have seen no evidence that Linux users don't pay for apps. The only thing saying it does is scare developers away from a perfectly good source of income.
It looks like he built an outlook extension. I don't know of any applications in the same cadre on Linux for which users pay. Oracle and RHEL itself are two examples where users pay for the software; I can't recall any other significant examples from the top of my head.
Despite this oft repeated statement, I have seen no evidence that Linux users don't pay for apps. The only thing saying it does is scare developers away from a perfectly good source of income.