If you have PST file of ANSI and you want to convert it into Unicode PST for some reasons, then try PST Upgrade tool
Outlook 2000 and earlier version support work on ANSI and uses the ANSI format to store data into PST file but with outlook 2003 Microsoft started using UNICODE format for storing data into PST file. Outlook 2003 and later version does support ANSI version of Outlook for backwards compatibility reasons, but you can't open UNICODE outlook PST Outlook 2000.
The PST Upgrade and downgrade is a tool which let you convert your ANSI PST to UNICODE PST and UNICODE PST to ANSI PST conversion with the most professional manner.
* Below options must be installed in order to flawlessly operate Shoviv software
Operating System (32 or 64 bit): Windows 10/8.1/8/7/Vista/XP, Windows Server 2003/2008/2008 R2/2012/2012 R2/2016 (Any of them)
Hard Disk: Minimum 100 MB of free hard disk space
Processor: Minimum 1 GHz Processor (2.4 GHz is recommended)
RAM: Minimum 512 MB of RAM (1 GB is recommended)
MS Outlook (32 or 64 bit): Outlook 2000, 2003, 2007, 2010, 2013 or 2016 versions.(Outlook 2013 is recommended)
Fast conversion of your ANSI to UNICODE Outlook PST file save your precious time by using this PST Upgrade & Downgrade software.
Convert ANSI PST to UNICODE PST format so that it could be easily accessible by Outlook 2003 and later versions of MS Outlook.
Convert UNICODE PST to ANSI PST format for easy accessibility of PST file into Outlook 2000 and other older Outlook versions.
No size barrier of PST file so that you could perform the conversion of ANSI to Unicode and vice-versa on almost any size of Outlook PST file with any problem.
The software is compatible with almost all the windows operating systems and can run on any version of Microsoft Windows OS.
Perform operation multiple Outlook PST files at once this option is very helpful if you have more than one PST files and you want to perform conversion on all and don't want to waste time in converting each file individually.