Microsoft is fixing the Outlook bug that causes “:)” to revert to “J”
businessinsider.com
businessinsider.com
At least I never replied to anyone with an explicit J, as in "Thank you J"
Strangely felt better when I realised it was a smiley face.
Of course hindsight is 20-20, it's easy to say now they should've gone with a character that wasn't in use yet, but circumstances being what they were, a bug is not a completely correct description for what this behavior is.
Furthermore, it's just a configuration issue. You can change it (it's in the autocorrection settings).
And by the way this is especially messed up if you use a screen reader.
Of course, in this case, it's "not Windows" so it must suck worse than the Windows version.