This line was dictated with a "non-medical" profile using MacSpeech Dictate Medical:
Dear Mr. Wines,
This line was dictated with an "education/medical writer" profile using MacSpeech Dictate Medical:
Dear Mr. Wines,
So in the context of a salutation, the word is transcribed correctly.
However, I've had problems opposite to yours with the word "mister." In my experience, it is difficult to get Dictate to spell it out. In my use, it is almost always transcribed in the abbreviated form. The specialized, medical profiles do not want to even suggest the spelled out word in the training window. However, a non-medical profile will at least make the suggestion of the spelled-out form in the training window. I do not have a lot of experience using this word, but one would hope that with repeated training, it would learn to prefer the desired choice.
As I have said in other posts on this forum, sometimes it's easier to set up a text macro for difficult words than it is to make repeated attempts at training something that Dictate has a hard time learning. In other words, I like to go with the flow and make the most of Dictate's power rather than focusing in on its few inadequacies. It most definitely has areas of inadequacy, but in my view, the benefits outweigh them by a long shot.
Charlie