If you want to recover the deleted files from MS Outlook then here are the steps for you :-
>> First of all create a windows restore point, as we are going to edit the registry, so for the safer side it’s recommended to do that.
>> Open “Run” box and then type “regedit”, hit enter
>> Now you need to find the location HKEY_LOCAL_MACHINESOFTWAREMicrosoftExchangeClientOptions
>> Go to the “edit” menu click “Add Value” and put these details :-
Value name: DumpsterAlwaysOn
Data type: DWORD
Value Data: 1
>> Now come out of this registry menu and restart your Outlook.
>> Now go to the “Tool” menu of the outlook and select “Recover Deleted Items”.