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One of The safest ways is to create a new Unicode PST and move the old Outlook items from the previous ANSI PST file. Here I am going to suggest with Softaken 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.
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.
http://www.outlookconverter.net/ansi-to-unicode-pst/