How to Merge ANSI and Unicode PST Files Together?

Older PST files use ANSI format and have size limitations, while new versions use Unicode. Outlook does not support directly merging these two formats manually. The easiest solution is to use a PST merging application like Advik PST Merge Tool, which supports both ANSI and Unicode PST files. The software merges them smoothly into a single Unicode PST file without data loss, corruption, or compatibility issues.