How to Convert PST to MBOX, EML, PDF, or CSV on Mac

There is no single best format for a PST conversion. MBOX, EML, PDF, and CSV solve different problems, and choosing the wrong one creates more work later.

If you want to move a mailbox into Apple Mail, use MBOX. If you need individual portable messages, use EML. If a person needs to read or print records, use PDF. If you need sorting, filtering, or analysis, use CSV.

This guide shows how to choose the output, export selected Outlook PST folders on a Mac, and verify the result without uploading private mail.

Before You Convert the PST

Make three decisions first.

1. What is the destination?

Do not convert merely because the PST is inconvenient. Decide what must happen next:

• Import mail into Apple Mail or Thunderbird
• Preserve individual emails as files
• Create readable or printable records
• Analyze message metadata in Excel or Numbers
• Recover contacts and calendar events
• Preserve a mixed archive with transparent warnings

The destination determines the format.

2. Which folders actually matter?

Large PST files often include years of duplicated, obsolete, or irrelevant data. Exporting everything can generate hundreds of thousands of files.

Open the archive first, inspect its folder tree, and select only what you need. A focused export is faster to verify and easier to store.

3. Where will the output live?

Converted mail is normally stored as ordinary unencrypted files. Choose a local folder with enough free space and appropriate access control. Do not put confidential exports into a broadly shared cloud folder by accident.

PST to MBOX: Best for Mailbox Migration

MBOX stores many messages in one mailbox file. It is the best general target when you want to import folders into a compatible mail client.

PST Archive creates one mboxrd mailbox for each selected mail folder and mirrors relevant PST hierarchy as directories.

Use MBOX when:

• You want to import mail into Apple Mail
• You want to move folders into Thunderbird
• You need one mailbox file per source folder
• You want MIME messages and supported attachments kept together

Avoid MBOX when:

• You need one file per message
• You want fixed documents for printing
• You need spreadsheet analysis
• The receiving system does not import MBOX

Import the result into Apple Mail

1. Export selected PST folders as MBOX.
2. Open Apple Mail.
3. Choose File > Import Mailboxes.
4. Select Files in mbox format.
5. Choose the exported mailbox files.
6. Check the imported folders, dates, bodies, and attachments.

Apple Mail controls the final import behavior. Always test a representative folder before importing the entire archive.

PST to EML: Best for Individual Messages

EML is a standard MIME message file. Each output file represents one email and can include headers, body alternatives, and supported attachments.

Use EML when:

• You need individual message files
• A document system ingests EML
• You want to exchange selected messages without a full mailbox
• You need message-level filenames and folders

Avoid EML when:

• The archive contains hundreds of thousands of messages and file count matters
• You need a single mailbox for import
• The destination is a spreadsheet or report

PST Archive reconstructs MIME messages from available PST properties. It also retains original header information in machine-readable output where available. As with any PST conversion, unusual or damaged records may generate warnings.

PST to PDF: Best for Reading, Printing, and Sharing

PDF creates a fixed document that does not require an email client. It works well for correspondence review, paper records, selected business files, and controlled sharing.

PST Archive produces one paginated text-layout PDF per selected item and saves supported attachments alongside it.

Use PDF when:

• A person needs to read the output without a mail client
• You need a printable record
• You are preserving a selected set of messages for review
• File-by-file document handling is more useful than mailbox import

Understand the limits:

• PDF is not a mailbox format.
• Complex HTML email design is not reproduced in the text-layout output.
• Attachments are saved separately instead of being universally embedded.
• An image-only or unreadable body may produce a warning notice instead of invented text.
• A folder with 20,000 messages will create a lot of PDF files.

Use EML or MBOX when message fidelity and future mail-client import matter more than fixed presentation.

PST to CSV: Best for Analysis and Inventory

CSV turns archive records into rows that can be opened in Excel, Numbers, databases, and analysis tools.

PST Archive writes UTF-8 CSV with CRLF line endings, quoted fields, and spreadsheet formula-injection protection. Its columns include item type and JSON item details so contacts, dates, locations, task status, and other mapped fields can share one export contract.

Use CSV when:

• You need to sort by date, sender, recipient, or subject
• You want to inventory an archive
• A compliance or operations team needs a spreadsheet
• You need machine-readable data for a controlled internal workflow

Understand the limits:

• CSV does not contain attachment bytes.
• Email layout and threading do not survive as visual presentation.
• Rich-text-only bodies may be reported instead of flattened incorrectly.
• Long body text makes spreadsheets unwieldy.
• CSV is not suitable for importing mail into an email client.

Enable separate attachment extraction when you need both tabular data and the source files.

VCF, ICS, TXT, RTF, and JSON for Non-Mail Items

A PST can contain much more than mail. A complete workflow needs sensible destinations for other records:

• VCF for contacts and compatible contact groups
• ICS for compatible calendar events and non-recurring tasks
• TXT or RTF for notes and journal content
• JSON for decoded source properties and records that do not map cleanly

PST Archive’s Archive mode is the best starting point for mixed data. It produces practical files where possible and retains structured source information plus explicit warnings where a reliable portable conversion is not available.

This is more honest than calling every generated file a successful conversion.

Step-by-Step PST Conversion on Mac

Step 1: Open the PST

Choose the source with the native macOS file picker. PST Archive opens it read-only.

For supported password-protected archives, enter the known PST password. Validation happens locally and the password is cleared when the archive is closed or replaced.

Step 2: Inspect the folder structure

Browse folders before selecting output. Preview important messages and other records. Search the current folder by title, sender, or recipient when useful.

Step 3: Select folders

Switch to Export Options and check only the folders that belong in this job. Selecting a parent includes descendants, so review the tree before starting.

Step 4: Choose the format

Use this shortcut:

• MBOX for mailbox migration
• EML for individual messages
• PDF for readable documents
• CSV for analysis
• Archive for mixed Outlook content

Step 5: Run a sample first

The free sample includes the first 10 ordinary items per type across the PST. It is fixed and deterministic, so changing formats or folder selections does not create an unlimited free export.

Use the sample to inspect naming, folder layout, body output, attachments, and reports before unlocking a full conversion.

Step 6: Review the output

Do not stop at a green completion message. Check:

• Export Report.txt for human-readable totals and warnings
• manifest.json for the complete structured job state
• issues.jsonl for detailed warnings and failures
• Representative messages from several folders
• Attachments with different formats and sizes
• Non-English text and unusual dates
• Contacts and recurring calendar events if they matter

Step 7: Test the destination

Import a small MBOX into the target client. Open several EML files. Inspect PDFs. Sort the CSV. Import sample VCF and ICS records into a test location.

The destination app is part of the migration. Output that is technically valid but unusable in the receiving workflow is not finished.

Privacy and Security

PST archives are high-risk files because they concentrate years of communication in one place.

PST Archive performs viewing, search, known-password validation, and conversion locally on the Mac. Archive content is not uploaded to a conversion service. The source is opened read-only, and each job gets a new output directory.

Generated files are not automatically encrypted. Protect them with the same care as the original mailbox.

What PST Conversion Cannot Promise

No responsible tool should promise universal lossless conversion of every PST.

Potential limitations include:

• Damaged or unreadable properties
• Missing attachment payloads
• Complex Outlook-specific recurrence rules
• Rich-text-only bodies
• S/MIME or other message-level encryption
• Hidden associated records
• Deleted-data recovery
• Proprietary properties with no equivalent in the chosen output format

Keep the original PST, read the reports, and verify high-value records. The objective is useful, transparent output, not magical certainty.

Final Recommendation

For most migrations, start with MBOX. It preserves folder-level mailbox structure and works with common Mac mail clients.

Add EML when you need individual messages, PDF for readable records, and CSV for analysis. Use Archive mode when the PST contains contacts, calendars, tasks, notes, journals, and unknown records that deserve explicit preservation.

For alternative products and tradeoffs, read our best PST viewer and converter for Mac guide and PST Archive vs Enolsoft PST Viewer comparison.