Customers often use 3rd party tools like Actiance to archive IM conversations into Enterprise Vault. With Actiance the conversations are archived as EML and not MSG as expected by Symantec eDiscovery Platform powered by Clearwell, it would be very handy to have the functionality to deal with EML and covert to MSG on the fly in these situations as this would stop collections failing.
At present, the only known workaround is to go ahead and convert all EML to MSG and re-archive on EV and collect against this OR collect all EML and put into a PST and discover and process as a source on eDP.