Reduce PST File Size - Version 4.0 Before start reducing PST file size is best to take trial run its auto split PST file size which perfectly optimum for you. Now you can start reducing PST file size into UNLIMITED large PST file into smaller fragments. SysTools fast and easy to use service provides for its users, SysTools organizations an effective software service for online markets. If you have so many PST files and its hamper your Outlook work and you need to reduce PST files size. Try Split PST which is providing 100% satisfaction result according to your choice. Reduce PST File Size another computer program of SysTools to reduce the maximum file of Outlook PST file at a fraction of time. Make Outlook splitting process you can also use some of the excellent and time saving options like:Split PST by Date: This tool will help you if you want to fragment heavy data by the date of PST.Split PST by Size: If you want to split PST by the size of PST then you can use this option as soon as possible. Split PST by Year: This tool defiantly helps you to