How to generate conversation search report?
The Conversation search report is used to search for a mailitem based on the user input.
Perform the following steps to generate a Conversation Search Report:
Select Exchange Online Reports from the available vertical tabs. Then from left pane of application, select Conversation.
On the selection of "Conversation Search" from the list of available reports, a dialog is displayed as shown below:

On selecting the desired mailbox and entering the title of the mail to search, the resultant data are displayed in a window as shown below: