PST Upgrade is the advanced windows utility that effectively upgrade Outlook email client from old to new and new to old version. The utility quickly convert ANSI to Unicode and Unicode to ANSI in a safe mode without alteration on the original PST files. The software also allowed to add new PST files to Outlook profile directly.
If you would like to get the process going then go here: softakensoftware.com/ansi-to-unicode-converter.html