If you wish to Export the mailbox to PST from Exchange 2010 without losing any data. So you can take the help of Enstella EDB Converter Software. Using this tool you can easily Convert all emails from EDB file to PST in one simple click on the mouse. And it also split a large PST file into multiple smaller size PST files. It has a free demo version where you can easily convert 25 items from every folder without any cost.
Know more:- https://www.enstella.com/blog/how-to-export-mailbox-to-pst-from-exchange-2010/
