Boston Globe Online: Sharing the riches -- Mitch Kapor uses his personal fortune to create free software he says will outdo Microsoft Outlook ''One of the certain things in the marketplace is that Microsoft products tend to advance when they are challenged,'' Marc Andreessen, a creator of the Netscape Communications browser that prompted Microsoft's abrupt shift toward Internet-based software, said in a recent interview with the Globe. ''It won't necessarily put price pressure on them, but at least it will cause them to maybe innovate.''