Hello,
It is my opinion that you should not export a Journal Archive to a PST file. I would only do this if your legal and compliance department gives you a written approval they will accept these results. I suggest to first try the export to PST using PST = 2048GB. The default is 20480 (20GB). As sidenote, PST of 50GB is not very reliable..
As you write "Legal Hold Data", is there a Discovery Accelerator installation (as Peter asks)? If so, export the hits from there. That gives you the 'legally accepted' exports.
