Our engineers installed the dtSearch Desktop (Evaluation version). It indexed the converted PST file and we can search contents. We have followed the instructions below from the dtSearch:
(A) To index Outlook messages and other information in your Outlook profile,
1. Open dtSearch
2. Click Index > Create Index
3. Enter a name for the index and click OK
4. In the Update Index dialog box, click Add Outlook to add one or more Outlook folders.
5. Select the folders to index and click OK to close the Select Outlook Folders dialog box.
6. Click Start Indexing.