Split Outlook PST Tool to split any Size PST file
Step 1: Install & Run PST Splitter Software.
Step 2: Select Outlook format and Split Option (Split By Size, Date, Year, Folder, or Email ID)
Step 3: Select Size & specify in MB from which you want to split oversized PST file.
Step 4: Click on Split button and check status report.
If you want to break large the PST items in small parts, Here I recommend you try the Split PST Tool that can easily split large PST items according to date, year, size and folder option without installing MS-Outlook in your system. It split both ANSI and UNICODE formats. It supports all windows and Outlook versions.
Visit here for more info: http://www.split.pstfile.org/