Marc Benioff, CEO of SalesForce in Fortune:

As we try to keep pace with these changes to a new computing industry, we are left with only two choices: innovate or die. Microsoft like DEC before it, and IBM before it, tried too long to hold on to its Windows model believing it was permanent in an industry of impermanence. But it didn’t work out that way. Google outsmarted Microsoft into the Internet, and it dominated the next Internet paradigm. Now Apple is the clear winner in the new mobile paradigm.

The only constant is change.