Outlook PST Conversion Tool - Version 2.0 Try out Outlook PST Conversion tool that is tremendously advanced utility which helps you to convert ANSI to Unicode PST and to convert Unicode to ANSI PST file format with ease. PST Upgrade tool by SysTools is the perfect PST Conversion tool to convert PST files into ANSI or Unicode PST format and easily increase Outlook mailbox size or convert Outlook 2GB to 20GB PST format. PST conversion tool can convert PST files or to convert Outlook database showing “Properties for this information service must be defined prior to use” from ANSI to Unicode PST format. Download free demo version of PST conversion tool to convert first 3 folders from PST files. To convert unlimited PST files, you need to invest in full licensed version of the tool at only $49.