I've just changed to Win 8.1 and Outlook 2013, and have discovered something really annoying.
I have access to another mailbox, but when I try to reply to mail in here, it sets the sending address as my main mailbox. I've checked in Options and the 'Send from Default' box is unticked. Anyone come across this issue before, and if so, how did you fix it?
It's really grinding my gears...