Have you been working with an older Outlook version (2000 or 2002) that saves email data in files with ANSI PST format? Do you want to convert these email files from ANSI format to Unicode PST format of newer Outlook version (2003 or 2007, 2010 and 2014) for upgrading Outlook?
A remarkable and attractive feature of ANSI to Unicode converter in newer Outlook versions (2003 & 2007) is that of the PST file size limit, which is 20 GB as against 2 GB in older versions (2000 & 2002).
Microsoft Outlook has a feature that helps you to upgrade Outlook and to convert ANSI PST to Unicode PST, but it is very difficult to use and execute. This must have enforced you to look for outside options to upgrade Outlook PST file folders by converting PST from ANSI to Unicode format.
Professional help in the form of a third-party upgrade Outlook data file tool like PST Upgrade software is an apt way to go about this conversion. Using PST Upgrade software, you caneasily Outlook ANSI(2002) to Unicode(2007). You can even degrade Outlook using this dual-purpose tool to convert Outlook 2007 PST to Outlook XP.