Conficker phones home on April 1: Y2K or April Fool?

April 1st, as many of us know, is when the conficker worm ‘phones home’.

This is the worm that has infected millions of PCs and Microsoft has offered a $250K reward for finding the people responsible.

What do you think? April-fools joke or some serious consequences?

Note the Y2K reference since nothing bad really happened after 11:59:59 on 12/31/99.