Here is an easy way where you can easily Split your large size of PST file into smaller size of PST files. Try this third party tool Regain PST Splitter Software and it will help you to Split oversized PST file into smaller parts. you can easily save your PST files into your desired location. this software easily Split both ANSI PST and UNICODE PST file. This Software supports all the versions of MS Outlook and Windows OS.