Upgrade ANSI to Unicode PST format with workable ANSI to Unicode conversion tool. This PST Upgrade tool (by SysTools Group) is user friendly interface that simply convert ANSI format to Unicode PST format. You can also degrade Outlook PST or convert Unicode PST files into ANSI PST file format with Outlook PST conversion tool. After using this tool you can easily open Outlook 2002 PST into Outlook 2007 with 20GB storage space. Software helps you to upgrade PST version from ANSI to Unicode and extends the PST size limit from 2GB to 20GB. ANSI poses 2GB limitation on PST and Unicode poses 20GB limitation on PST. You cannot store more than 2GB data in ANSI PST format if you try to store more than 2GB data in ANSI PST file then PST file will become corrupt, at that situation you must be upgrade Outlook PST version. You can download free trial version of PST Upgrade tool, demo version of PST Upgrade converts only first three folders. Buy full licensed version and upgrade unlimited Outlook PST files easily. You can purchase full license version of Outlook PST Upgrade that is available for you only at 49 USD.