Split Outlook archive PST Files crossing 2 GB size, which decrease the working speed of MS Outlook as per the requirement. Users need to use split Outlook PST file software to reduce PST file size and avoid corruption due to 2 GB of size limitation. Split PST is best tool to reduce PST file size by splitting them into smaller parts by Date, Year, Folder and Size. . The software supports all version of MS Outlook 2000, 2003, 2007, 2010 .