Extends PST storage capability and convert Outlook 2002 PST files into Unicode PST file format easily with Outlook PST Upgrade tool. This ANSI to Unicode conversion is the best solution to get rid of Outlook corruption. You can easily transfer Outlook mailbox from ANSI to Unicode format. ANSI is the old version of Outlook PST it exists in Outlook 97 to Outlook 2002 and poses 2GB limitation on PST, Unicode is the latest version of Outlook PST exists in Outlook 2003 to Outlook 2007 and poses 20GB limitation on PST. You can easily convert all old versions PST into new version PST and upgrade PST version easily. Outlook is very popular email client but old version of Outlook (Outlook97 to 2002) does not contains more than 2GB PST, if your PST extends more than 2GB limit then Outlook PST will become corrupted you need to Upgrade Outlook PST from ANSI PST to Unicode PST. Download trial version of SysTools PST Upgrade tool free of cost but demo version of PST Upgrade tool convert only first three folders. Purchase full version of PST converter and convert unlimited PST files from ANSI to Unicode, license version is available only at 49 USD.