ANSI to Unicode - Version 2.5 ANSI to Unicode conversion application can upgrade, degrade Outlook PST files in any edition of PST email program. After using this tool you can easily open Outlook 2002 PST into Outlook 2007 with 20GB storage space. 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 an ANSI PST file then PST file will become corrupt and users lost their important PST data, to secure PST file data users need to upgrade their PST file from ANSI to Unicode. You can download free trial version of ANSI to Unicode conversion tool, demo version of can convert only first 15 mails from each folder of PST file. If you want to convert more PST data ANSI to Unicode then you need to invest only $49 and get access to convert unlimited PST data.