Now with Dropbox support, works as advertised. A must have.

The developer has been very supportive and now, with Dropbox capability, this app works as advertised and is a "must have" if you need access to your Exchange PST files on your iPad. Try storing your PST files an a Dropbox directory, keep them fairly small in size and…"presto" no laptop needed for your travels...

Leofwin about Pst Mail