If you're looking for a PST splitter, I recommend you Shoviv PST Splitter for best results. It has lot of advanced features that increase your efficiency and save time. It runs on all Windows versions and Shoviv PST Splitter give you free trial, so user know about its GUI and speed of splitting. https://www.shoviv.com/blog/how-to-split-pst-file-in-outlook-manually/