Exchange recovery and emails converter software?

I am searching a free tool that can convert and recover exchange emails databases, And i got these tools and threads:

http://social.technet.microsoft.com/Forums/exchange/en-US/95e02ab4-8d70-48ae-aa69-64c7a86d0e8c/migrate-exchange-2007-to-2010-while-decommissioning-public-folders?forum=exchangesvrdeploylegacy

http://edbtopstfile.blogspot.in/

http://technet.microsoft.com/en-us/library/bb124040%28v=exchg.65%29.aspx

Now my question is that what these type demo tools can recover and save my data in outlook?