• People who worry about "Open Source Doomsday" have lost sight of one fundamental fact: If having a program written is a net economic gain for a customer over not having it written, a programmer will get paid whether or not the program is going to be free after it's done.
• ...most estimates put the proportion of all code written in-house at companies other than software vendors at over 75%.
• Support Sellers (otherwise known as "Give Away the Recipe, Open A Restaurant"): In this model, you (effectively) give away the software product, but sell distribution, branding, and after-sale service. This is what (for example) Red Hat does.
• Loss Leader: In this model, you give away open-source as a loss-leader and market positioner for closed software. This is what Netscape is doing.
• Widget Frosting: In this model, a hardware company (for which software is a necessary adjunct but strictly a cost rather than profit center) goes open-source in order to get better drivers and interface tools cheaper. Silicon Graphics, for example, supports and ships Samba.
• Accessorizing: Selling accessories – books, compatible hardware, complete systems with open-source software pre-installed. It's easy to trivialize this (open-source T-shirts, coffee mugs, Linux penguin dolls) but at least the books and hardware underly some clear successes: O'Reilly Associates, SSC, and VA Research are among them.

MICROSOFT WILL GIVE governments and international organizations access to the programming code underlying several versions of its Windows operating system to allay security concerns, the company announced Tuesday. ~ Infoworld

[To find out what will eventually and surely happen to Microsoft, study the history of the Roman Empire.]