For Merging the multiple PST files as a single PST file, you can try Aryson Outlook PST Merger Tool which securely combine multiple PST files without any data loss. This software combines PST files with all mailbox data items such as emails, contacts, calendars, etc. Moreover, the tool supports ANSI and UNICODE PST file formats and provides easy to use user interface.
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Outlook PST Merger Tool
Re: Outlook PST Merger Tool
You can try SoftMagnat PST Merge Software to easily merge multiple Outlook PST files into one. This tool seamlessly combines emails, calendars, contacts, tasks, and journals from multiple PST files. It offers two options: Join PST Files or Merge PST Files. The software eliminates duplicate items and supports merging both archived and password-protected Outlook files. You can select specific folders to merge, saving time. Merge files into a new PST, an existing PST, or directly into your Outlook profile. It also features a search option to quickly locate specific PST files. Compatible with Windows 10 and Outlook 2019.