To merge multiple PST file into single, if you want to merge two or more than two (multiple) Outlook PST file into singe file of any versions of MS Outlook, try Merge PST tool that allows to slecting multiple PST file to merge or combine them into single PST file format without any loss.

https://goo.gl/Xf5Pnu


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Get DBX to PST Converter is a professional utility for the migration of Outlook Express DBX Files into usable and importable Outlook PST files. It can safely export all the valuable emails with attachments.It is designed to find and show the location of default identity of Outlook Express. It also allows users to choose the Identity.It also also convert DBX to Outlook PST enables user to batch convert DBX to PST/RTF/EML/MSG/Thunderbird, offering a versatile setup to access Outlook Express emails.

For Free demo version, you can visit:  http://www.mannatsoftware.com/stellar-dbx-to-pst-converter.html