If you have multiple PST files and you want to merge them in one PST file, try Merge PST Tool to easily complete this task with simple mouse click. It supports both ANSI and UNICODE PST file and merge multiple PST files in one PST file without any data loss.
Visit here for more info: https://www.osttopstapp.com/pst-merge.html
If you want to combine multiple PST Files into single PST file, try Bitdataconversion PST Merge Software this tool merge multiple PST files into single PST file without any size limits and data loss. This tool works both Unicode and ANSI PST files.
For more information visit - https://www.bitdataconversion.com/merge-pst-files.html
Nathandoch
PST Merge Tool to Merge Multiple Outlook PST files