How many times have you seen a sentence in an email that looks like this: “I’m really looking forward to seeing you tonight! J” Or “I know what you’ve been up to! J”, or any other variation, but ending with the cryptic letter J, all on its own, and wondered “What’s up with that letter J??” Does it stand for “just kidding”? (That would be ‘j/k’.) Joking? Jump? It turns out that it’s caused by Outlook, and Outlook doesn’t, apparently, have a sense of humor. It’s Outlook trying to smile – or, more precisely, it’s Outlook’s version of a smiley face.