How to Recover my deleted Email from MS Exchnage server

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http://ubuntuforums.org – Hi Guys i am new in this forums with a common problem and want a help from all of you actually i used Outlook with Exchange Server 2007 and few days ago i lost some important mail due to dirty shutdown of Server now I want to recover my deleted emails from MS Exchange Server database files.can you please provide me some solution. Additional Information : some information suggest by my friend that my EDB Database File is corrupted. My friend give me suggestion to convert EDB File Into PST File. Now i am waiting for response from this forums users and expert please help. Thanks in A (Hardware)