Good day Mathew. You will need to deploy the mailbox agent to be able index for eDiscovery.
You can perform legal and compliance-related searches using simple searches or advanced search queries. Relevant data can be added to a case or can be exported to deliver the data in convenient and useful formats.
You can work with the following data in the eDiscovery and Compliance solution:
- Exchange User Mailbox (Exchange archiving)
- Exchange Journal Mailbox (Exchange journaling)
- Exchange SMTP Contentstore Mailbox (SMTP journaling)
Below are some helpful links for Activate.
Activate Requirements
https://documentation.commvault.com/commvault/v11/article?p=119988.htm
Agent used
https://documentation.commvault.com/commvault/v11/article?p=96392.htm