Microsoft, today, announced the Messaging & Security Feature Pack for Windows Mobile 5.0 and this BlackBerry Killer may actually have some teeth.  Together with SP2 for Exchange 2003, the Messaging & Security Service Pack for Windows Mobile 5.0 will compete directly with Research in Motions ever popular BlackBerry and “Push” based email technologies from Good Technology and Visto. Oh, and by the way, it is free.  That’s right.  The expensive server side piece required by other solutions comes as a free service pack for companies already on Exchange 2003.  This free addon for Exchange 2003 will make Microsoft a big time player in the “Push” email game from day one.