Get MS Outlook PST Splitter to keep a check on the slowdown of the performance of the large sized outlook PST file. When the number of Outlook PST files reaches the limit of 2GB. There are chances of corruption. But by using PST Split Tool, you can easily come out of this problem without losing single bit of information. PST Split Tool splits or divides large size Outlook PST files items such as contacts, emails, calendars, journals, etc.