1999


 * January 31: Apple runs its first Super Bowl commercial in years, to promote that Mac OS does not have a Y2K bug, though the 2020 bug would not be fixed until Mac OS 9.0.4 was released in April 2000.
 * May 10: Mac OS 8.6 is released.
 * May 10-14: The 1999 Worldwide Developers Conference is held in San Jose, California.
 * October 23: Mac OS 9 is released.