- February 13: Mac OS X 10.2.4 is released.
- April 28: The iTunes Music Store is introduced, offering songs for only $0.99 each.
- Apple stock (AAPL) increases more than tenfold from around $6 per share to over $80.
- The Aqua theme, introduced as part of Mac OS X in 2001, begins to be phased out in favor of cleaner designs, such as glass.
- Greenpeace campaigns against Apple's use of particular chemicals in its products.