Conversation so far:
when does the Michelangelo computer virus take effect every year?
In the case of Michelangelo, once the virus infects a computer, it remains dormant until a specific date—March 6 of each year, to be exact.
why did the Michelangelo computer virus take effect on March 6 every year?
the birthday of Renaissance artist Michelangelo
What computer operating systems does the Michelangelo computer virus affect?
DOS
what does the Michelangelo computer virus do?
Michelangelo is classified as a boot sector virus, a type of virus that infects the startup sectors of storage devices.

Question: when was the last reported case?
Self-contained rewrite: when was the last reported Michelangelo computer virus case?