We've been helping you follow along during the beta path for the Microsoft Message Analyzer. If you remember, there was a final update to the beta build on August 2, 2013 (talked about HERE).
Announced at SNIA SDC 2012 conference in Santa Clara, CA in September 2012, Messaging Analyzer is the replacement for the much-loved Microsoft Network Monitor. Messaging Analyzer was originally targeted for a mid-2013 final release, but that date slipped a bit.
Formally released on September 24, 2013, Microsoft Message Analyzer is now available to download from the Microsoft Download Center.
You can grab it here: Microsoft Message Analyzer
If you want support or want to ask questions, Microsoft has put together a formal support forum on the TechNet site here: http://social.technet.microsoft.com/Forums/en-US/home?forum=messageanalyzer