ANSI Unicode Converter - Version 2.0 ANSI Unicode converter - Using Outlook PST conversion tool you can easily execute both process like upgradation of PST file and degradation of PST file. ANSI Unicode conversion tool allows users to convert Outlook PST files or convert ANSI PST to Unicode PST file with just few mouse clicks. Upgrade Outlook data file, convert Unicode PST to ANSI PST and increase Outlook PST file size (from 2GB to 20GB) limit with the help of SysTools PST Upgrade. Download free trial version of Outlook PST conversion tool that allows users to convert only first three folders from Outlook PST file. To degrade and upgrade multiple MS Outlook PST file, then you must invest in full process version of the tool at only 49 USD.