Just occurred with a left shift question mark, shut down Outlook, brought it up, but could not replicate. Even tried "left Ctrl ?" but nothing. Then i copied the text up to the "?", pasted it into a new return email, tried to replicate but could not. Sadly, the only explanation i can come up with, is that this is a case where an MS "update" of some sort has messed up a number of computers out there but not enough to put forth the effort to correct, and the lack of MS response is that they don't want to acknowledge the issue. Kind of sick, but that is the only explanation i can think of for their not responding as they historically were fairly quick to respond.