WinPST Ansi PST to Unicode Converter is a simple yet powerful PST conversion
tool to convert Ansi PST to Unicode PST and vice versa. To use the Converter
to convert Outlook PST files, you must have Microsoft Outlook 2003, 2007 or
2010 installed with a valid profile. To avoid corruption due to exceeding the
size limit of 2 GB imposed on older ANSI PST files, you need to convert them
to Unicode PST files to enhance the size limit to 20 GB. (in Business and
Productivity)