This is very nice thread from you. As the requirement increased over voice to text at presence, may windows will introduce some software in future. The needs are increased depend upon the necessity. All the educational institute requires the voice into text format which will help for the students notes in their studies. So there will be no other doubt, that surely new software will come in future.
This is really nice question about the software who can convert text into voice.But i don't think so that any software which can convert text file into voice. Yes but some software available who can just speak your word when you insert or match your voice with them.Suppose If your write in their directory then you ask them that will spoke your word.other wise there is no software.
If I am write CDAC developed some programs/software for Blinds and duff. not getting name but it may has this solutions. Means you only speak and get converted text files. Awesome tool not come across yet but sure it will more helpful to us.with best regards Vilas