Resolve the error of the User not receiving External Emails by using a third-party application, Enstella EDB to PST Converter software to repair the Exchange 2010 Database. They work very fast and solve all Exchange errors. It is totally secure and virus-free software. You can convert an unlimited-size file without any problem because it has no size limitations feature. The special feature of this software is it auto-detects the location of the edb file and starts repairing. Try the demo version of this software, on which you can export 25 emails from each mailbox.