What is the difference between prophesying and preaching? 
My understanding is that prophecy is not identical to preaching, but involves both forthtelling and foretelling. The reason women may prophesy but not teach or preach to men is that the message that the prophet gets from God is not filtered through the interpretive process—that is, it is directly mediated by the Spirit. Hence, in effect, prophecies are ‘tamper-proof,’ whereas teaching is not (cf. 1 Tim 2:12-14).  From Bible.Org
 			4 For as we have many members in one body, and all members have not the same office:
5 So we, being many, are one body in Christ, and every one members one of another.
6 Having then gifts differing according to the grace that is given to us, whether prophecy, let us prophesy  according to the proportion of faith;
7 Or ministry, let us wait  on our  ministering: or he that teacheth, on teaching;
8 Or he that exhorteth, on exhortation: he that giveth, let him do it  with simplicity; he that ruleth, with diligence; he that sheweth mercy, with cheerfulness.
9 Let  love be  without dissimulation.  Abhor that which is  evil; cleave to that which is  good.
10 Be  kindly affectioned one to another with brotherly love; in honour preferring one another;
Romans 12:4-10, KJV 
  
 			12  
13  
14  
                    1 Timothy 2:12-14, KJV. 
 			What thing soever I command you, observe to do it: thou shalt not add  thereto, nor diminish from it.  Deuteronomy 12:32, KJV. 
 
And if any man  shall take away from the words of the book of this prophecy, God shall take away his part out of the book of life, and out of the holy city, and from  the things  which are written in this book.  Revelation 22:19, KJV. 
 			My Observation 
Prophecy; event oriented
Preaching; process oriented
To me, the answer to the question of whether or not females should preach is very explicitly answered above, taken from the Holy Bible.                                                                                DonMcelyea.Com