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Upgrade Outlook PST

Outlook files created with MS Outlook 97-2002 versions are ANSI PST files. MS Outlook 2003 & above versions offer greater storage capacity for Outlook items and folders.
There is no automatic way of converting a Microsoft Outlook 97-2002 Personal Folders file PST to a Unicode-capable Microsoft Outlook Personal Folders file PST. The easiest way to convert a non-Unicode PST file is to create a new data file in the Microsoft Outlook Personal Folders file PST format that supports Unicode and then import items from the old data file to the new Microsoft Outlook Personal Folders file PST.
Check more info at:- Upgrade Outlook PST Files.

Microsoft does not offer a tool that upgrades the PST from ANSI PST to Unicode PST. The safest way is to create a new Unicode PST and move the old Outlook items from the previous ANSI PST file. PST Upgrade and Downgrade software is a platform with the help of which user can upgrade PST file, we have a solution for Batch Conversion of ANSI to UNICODE and UNICODE to ANSI PST.
See more info at PST Upgrade.