PST and OST files, from your own software.

import mailtria

mailtria.licence("MTK1-...")              # writing needs a key

with mailtria.open("archive.pst") as pst:   # reading is free
    for folder in pst.walk():
        print(folder.path, folder.count)
    for m in pst.search("invoice", limit=10):
        print(m.date, m.sender, m.subject)

report = mailtria.export("archive.pst", "archive.zip", format="eml")
print(report.status, report.output_items)

using Mailtria;

Kit.SetLicence("MTK1-...");

using var pst = PstFile.Open("archive.pst");
foreach (var f in pst.Walk())
    Console.WriteLine($"{f.Path} {f.Count}");

var report = Kit.Repair("damaged.pst", "repaired.pst");
Console.WriteLine($"{report.Status}: {report.OutputItems} recovered");

mailtria.SetLicence("MTK1-...")

pst, err := mailtria.Open("archive.pst")
if err != nil { log.Fatal(err) }
defer pst.Close()
for _, f := range pst.Walk() {
    fmt.Println(f.Path, f.Count)
}

report, err := mailtria.Split("archive.pst", "parts",
    mailtria.Options{"by": "year"})

Mailtria.setLicence("MTK1-...");

try (var pst = Mailtria.open("archive.pst")) {
    for (var f : pst.walk())
        System.out.println(f.path() + " " + f.count());
}

var report = Mailtria.merge(
    List.of("2023.pst", "2024.pst"), "all.pst", "merge");

#include "mailtria.h"

char *report = NULL;
int code = mt_run(
  "{\"op\": \"convert\", \"input\": \"mail.ost\","
  " \"out\": \"mail.pst\"}", &report);
/* 0 passed, 3 warnings, 5 licence key needed ... */
printf("%d %s\n", code, report);
mt_free(report);