When importing Microsoft Outlook messages (.msg) and\or Microsoft Mail Archives (.pst) event types into CA Data Protection and subsequently viewing the captured event from the CA Data Protection iConsole the mail "Subject" appears to be missing.
This issue occurs when the event importer does not have Microsoft Outlook installed.
The pre-requisites for Event Import are documented in the product documentation (link below).
CA Data Protection 14.x\15.x
Install a 32-bit version of Microsoft Outlook (2010/2012) and re-import the events.
Orchestria, Orchestria APM, Orchestria EPM, CA DLP and CA DataMinder are all versions of the product now known as CA Data Protection.