[link|http://www.nytimes.com/2004/07/30/technology/30soft.html|Pursuing Growth, Microsoft Steps Up Patent Chase]
"Microsoft said on Thursday that it planned to increase its storehouse of intellectual property by filing 50 percent more patent applications over the next year than in the previous 12 months.
Microsoft, the world's largest software company, increasingly regards the legal protection of its programming ideas as essential to safeguarding its growth opportunities.
...
Microsoft's stepped-up patent program, analysts say, will be watched closely in the industry to see if the company uses it mainly as a defensive tactic or as an offensive weapon to try to slow the spread of open source products."