Also:
Microsoft: http://money.cnn.com/magazines/fortune/fortune500/snapshots/879.html
IBM: http://money.cnn.com/magazines/fortune/fortune500/snapshots/676.html
Microsoft's revenue in '05 was ~$37 billion. IBM's was ~$97 billion.
In revenue, profits, and assets, IBM is *still* larger than Microsoft.
Microsoft, through their proxy SCO, decided to take on the only company with the financial and legal resources to crush them.
Correction: In revenue, profits, assets, and ethics, IBM is *still* larger than Microsoft.