If you want to take an instant backup of Exchange Mailbox to PST Use the SysInspire EDB to PST Converter software. This software can recover your EDB file which has been corrupted. It converts EDB files into many other formats like PST, EML, EMLX, MSG, and HTML. This software has an auto-detection feature, on which they can auto-find the location of an EDB file and get it repaired. You also try a demo version of this software, on which you can convert 25 emails from each mailbox.