Use APKPure App
Get PST Viewer old version APK for Android
PST Viewer संग्रहीत पीएसटी या OST फ़ाइलों को पढ़ने के लिए एक स्वतंत्र और उपयोगी उपकरण है
PST Viewer is a free and useful tool to read archived PST or OST files. This offline email client allows to you read archived Outlook emails and save/extract email attachments. The app will automatically scan all PST/OST files on your device. You can choose a PST/OST from the list or select the PST file you want to view from any file manager and open it with this application. Also, you can use this app as default PST viewer.
PST is "Personal Storage Table" file.
OST is "Offline Storage Table" file.