Regzion PST Viewer is a free, user-friendly tool to open and view PST files without Outlook. It supports healthy, corrupted, encrypted, and large-sized PST files, allowing you to access important Outlook items - emails, contacts, calendars, tasks, and attachments. Software also offers PST file conversion options and PST migration to Gmail, Yahoo Mail, Office 365, and IMAP accounts in its Pro/Pro+ version.
Software Guide
Step 1 ) Download and install Regzion PST Viewer software, Once installed, launch the application.
Step 2 ) On the main screen, click the "Select PST" button to begin the process of selecting the PST file you wish to open.

Step 3 ) Choose the preferred conversion mode based on your requirements: -
Single PST File Conversion
Select the "Single PST File Conversion" option and click the Next button.
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Click on the "Select PST File" or "Search PST File" button to browse and choose the single PST file from its location on your computer.
Bulk PST File Conversion
Select the "Bulk PST File Conversion" option and click Next button.
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Click "Add PST File" or "Add PST Folder" to import multiple PST files or folders.
After selecting the necessary PST files, click the Start Scanning button to begin the scanning process.
Step 4 ) The software will initiate the scanning of the PST files and load all available Outlook mailbox folders and items.
Step 5 ) Once the scan is complete, you can preview all Outlook mailbox items—such as emails, contacts, calendars, tasks, notes, and attachments — directly from the PST files.
Step 5 ) After loading your PST files, select the specific mailbox folder you wish to convert. Once you've made your selection, click on the Convert button in the menu bar to proceed.
Step 6 ) Choose the desired output format from the list of available conversion options: -
Step 7 ) After selecting the conversion format, adjust the following settings as needed: -
Step 8 )Once all the settings are configured, hit the Convert button to start the PST file conversion process.
In shortest time, Regzion PST Viewer will complete conversion of your PST files to the selected format, without losing any essential data.
Step 6 )After selecting the required PST files and mailbox folders, click on the Import into Cloud from the top menu bar.
Step 7 )From the dropdown list, choose the "Cloud Import Option" for your desired destination. You can migrate your PST files to.
Upload PST to Office 365 Mailbox
If migrating to Office 365, select the relevant options for the migration process: -
Step 9 ) Once all settings are configured, click on Convert. You will be prompted to sign in to your Office 365 account. After successful authentication, the software will begin the PST to Office365 migration process.

Import PST to Gmail/ Google Workspace(G-Suite)
Enter your Gmail account's Email Address and App Password, then click the Authenticate Login button to initiate the login process.
Step 9 ) Click Convert to begin PST to Gmail/Google Workspace migration process. The selected PST emails will be transferred to your Gmail account.

Import PST to Yahoo Mail
Enter your Yahoo Mail account email address and Yahoo App Password, then click the Authenticate Login button to securely log in.
Step 9 ) Click the Convert button to begin the PST to Yahoo mail migration process.
Migrate PST to IMAP Account
Enter your IMAP account's login credentials, including- Email Address, Password, Port, and Host Name.
Once the login details are provided, configure the following settings: -
Step 9 ) Click the Convert to start the migration process.