No results are returned when using properties “Created by” and “Last modified by” in SharePoint 2007 advanced search

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RESOLUTION:                        
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1.Install Infra Updates for WSS 3.0 and MOSS.
2.Open Central administration
3.Shared Services
4.SharedServicesX (X being the number of the shared services provider for the site you are creating a mapping)
5.Search settings
6.Metadata property mappings
7.Click "CreatedBy" to edit the properties
8.Make sure "Include values from all crawled properties mapped" is selected
9.Click on Add Mapping
9.There are two Office:4(Text) crawled properties. Map the first Office:4(Text) crawled property to the CreatedBy managed property. Move Office:4(text) to the top in the order

10.Click "ModifiedBy" to edit the properties
11.Make sure "Include values from all crawled properties mapped" is selected
12.Click on Add Mapping
13.Map the Office:8(Text) crawled property to the ModifiedBy managed property. And move it to top in the order
14.Complete a Full Crawl.
15.In the Advanced Search page, edit the page to modify the Advanced Search Web Part.
16.On the right pane expand the properties and click on the properties
17.Turn <Option Name="AllowOpContains" Value="True"/> from False to True in the Advanced Search Web Part Properties' XML.
18.Save and Publish the Advanced Search page.
19.Search for values in Created By and Modified By properties. The text you enter should match verbatim.