Using the File Analysis Reports feature, you can have the overall information about the content of OST file. Let us have a look at the reports available.
Total item types: Generates a graph between Total item types and item count.
Mail flow density by date: Generates a graph between Item count and date.
Mail flow density by senders: Generates graph between Item count and senders.
Interaction between users: Generates graph between Item count against Sender & Receiver pair.