Which of these virus incidents did not occur in 1999?

The Chernobyl virus, also known as CIH, is associated with significant incidents in the late 1990s but did not occur in 1999. It was first released in 1998 and is often remembered for its destructive capabilities, which included corrupting hard drives and making them inoperable if specific conditions were met.

In contrast, the other incidents mentioned are well-known for their occurrences in 1999. The ILoveYou virus, which spread rapidly through email, emerged in May 2000, but its impact was based on the popularity of similar social engineering techniques that had been exhibited in earlier years. The AnnaKournikova virus, named after the famous tennis player, also made headlines in 2001 when it spread via email with an attachment that appeared to be a photo of her.

The Michelangelo virus was noteworthy because it was set to activate on March 6, 1992, coinciding with the artist's birthday, which infamously raised fears about its data destruction potential. Therefore, understanding the timeline and characteristics of these virus incidents helps clarify why the Chernobyl virus is the odd one out in this context.