Evolution used in 25.10 (apt get install) has an issue to import PST files. Once it hits the problem Evolution can’t be started again and needs a reinstall of Ubuntu 25.10 (at least in my case). That probably causes loss of all existing email data. Here is the patch for
Mail: Crash with invalid UTF-8 folder name
https://gitlab.gnome.org/GNOME/evolution/-/commit/a541e2ae56f0ac627dcbe63e28fe99a89d0b12b4
Please consider to use the latest evolution in 26.04 ?