Installing Mac OS X 10.9 Enabled Apple Mail’s Junk Filter

Everything is working fine but I did notice that by default, Apple Mail launched with it’s Spam Filter on. I had to turn that off in preferences. 10.9 seems to switch that on and not respect the old preferences?

10.9 did not turn on Apple Mail’s junk filter for me, but (C-Command Software Blog - Mavericks Compatibility) a couple other users report that it did for them.