It has been requested to conduct a keyword search across all users in our Exchange 2007 SP2 for some legal purposes. I tried to use export-mailbox cmdlet in power shell to export the filtered search results into PST files. However, it generates one PST file per user even though the user's mailbox does not contain any mail item matching the filtered keyword in export-mailbox. In short, I ended up having more than 400 PST files in various sizes, and I do not know how to process those PST files easily to find out which one(s) have any mail items containing the actual keyword that I used in export-mailbox.
Could you please advice how to conduct such keyword searches across all users in Exchange 2007 SP2 in a easy and simple way?