What are the formats to which I can export mails for eDiscovery?

What are the formats to which I can export mails for eDiscovery?

Choosing 'Export' would create a ZIP of PST file of the emails that fall under the search criteria which can be downloaded from the eDiscovery portal.

'Export & Delete' will create the ZIP of the emails for download and will also purge the emails from the archives / backup storage.