Don’t just backup the PST — backup the :
HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\…
| Outlook Version | Typical default path | |----------------|----------------------| | 365 / 2021 / 2019 / 2016 | %localappdata%\Microsoft\Outlook | | 2013 | Same as above | | 2010 (Win7) | %USERPROFILE%\Documents\Outlook Files | | Archive PST | Often same folder, named archive.pst |