ReliefJet Essentials for Outlook - A large set of useful and easy-to-use tools for every Microsoft Outlook user: Import, export and convert using EML,MSG,TXT and PST formats; remove duplicate items, process attachments and extract addresses; get reports and statistics and even more...
ZOOK EML to PST Converter - Batch Convert EML to PST format to Migrate Windows Live Mail to Outlook PST
SysTools PST Merge - PST Merge Tool precisely join or merge multiple PST files in Outlook 2019, 2016, 2013, 2010
PST Merger - Merge pst files with free software that combines PST files into a single PST file.
ZOOK OST to PST Converter - ZOOK offers the tool to convert OST to PST format to import OST file to Outlook.
Regain Outlook PST Merger - Merge Multiple Outlook PST Files into Single PST file