OLM Converter · Viewer, Reader vs Mailbox
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OLM Converter · Viewer, Reader
Easily open, read, and convert Outlook for Mac archive files (.olm) on your devices. Browse mail, contacts, and calendar entries, then export them to various formats like MBOX, PDF, and CSV without needing Outlook.
- Open .olm archives without Outlook
- Read mail, contacts, calendar, notes, tasks
- Browse full folder tree and search mail
- Convert to MBOX, EML, PDF, CSV, HTML, vCard, ICS
- Export entire mailboxes or selected folders
- Process large archives on-device
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Have an OLM file you cannot open? OLM Converter opens Outlook for Mac archives right on your Mac, iPhone, and iPad, lets you read everything inside, and converts it to the formats you actually use. Open a .olm export, browse every folder, and read your mail, contacts, calendar, notes, and tasks. Then convert and export the parts you need, all on your device. WHAT YOU CAN DO • Open and read .olm archives from Outlook for Mac, no Outlook needed • Browse the full folder tree, and search mail by subject, sender, or text • View contacts, calendar events, notes, and tasks • See every attachment and save it to Files • Convert and export to MBOX, EML, CSV, PDF, HTML, vCard, and ICS • Export a whole mailbox, or just the folder you choose EXPORT FORMATS • MBOX, or a zipped folder tree of MBOX files • EML, one message per file, with the folder structure preserved • PDF for reading and sharing • CSV of the message list • A browsable HTML archive • vCard (.vcf) contacts and ICS (.ics) calendar events BUILT RIGHT • Runs on Mac, iPhone, and iPad • Everything happens on your device. Your archive never leaves it • No account, no sign in, nothing is uploaded • Handles large, multi gigabyte archives • Fast, reliable, and faithful to the original PERFECT FOR • Opening an .olm file on your Mac without Outlook • Anyone moving away from Outlook for Mac • Moving your mail into another app that reads MBOX or EML, such as Apple Mail or Thunderbird • Archiving, exporting, or simply reading an old .olm file OLM Converter is an independent app and is not affiliated with, endorsed by, or sponsored by any email software vendor. OLM and Outlook are referenced only to indicate the file format the app works with. Privacy Policy: https://rush.tools/privacy Terms of Use: https://rush.tools/terms
Mailbox
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Downloaded your email archive as an .mbox file and can't open it on your iPhone? Mailbox opens MBOX mailboxes — like a Google Takeout mail export — so you can read the messages and save their attachments, right on your iPhone. Choose the .mbox file in the Files app. Mailbox lists every message with its subject, sender, date and attachment count; tap one to read it. • EVERY MESSAGE IN A LIST — subject, sender, date and a paperclip count for messages with attachments. • READ THE MESSAGE — From, To, Date and Subject plus the message text. HTML emails are shown as clean readable text, and you can select and copy text. • ATTACHMENTS — see each attachment's name, type and size, and save it to Files with one tap. • REAL-WORLD MAIL FORMATS — multipart messages, nested parts, base64 and quoted-printable encoding, encoded subject lines and mboxrd-escaped lines are decoded. • SINGLE EMAILS TOO — open an .eml file to read one message on its own. Honest scope: Mailbox is a read-only viewer. There is no search, sorting or reply, and HTML emails are shown as text without images or formatting. Every message in the file is listed, and large archives of several GB open too: the mailbox is read from storage one message at a time instead of being loaded whole. Text in older encodings such as ISO-2022-JP, Shift_JIS or ISO-8859-1 is decoded using the character set the message declares. Your mailbox is read on your iPhone. Nothing is uploaded and no account is needed. Reading messages is free and unlimited. Saving attachments includes 3 free exports; a one-time $4.99 purchase unlocks unlimited attachment exports. No subscription, no ads. Questions: overlapmarr@gmail.com
Screenshots
Verdict
The clearest difference is device support: OLM Converter · Viewer, Reader at 4 against Mailbox's 1. On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. OLM Converter · Viewer, Reader sells 8 in-app purchases, starting at $4.99 per 7 days and Mailbox sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
OLM Converter · Viewer, Reader ships an update weekly, Mailbox every 5 days. The most recent releases landed on November 1, 2026 and October 24, 2026 respectively.
| Parameter | OLM Converter · Viewer, Reader | Mailbox |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| Update frequency | Weekly | Every 5 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone |
| Requires iOS | 15.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 24 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Rush Tools LLC | Jhomar Maravillas |
In-app purchases
OLM Converter · Viewer, Reader
- Pro Weekly3 Days trial$4.997 Days
- Pro Weekly$9.997 Days
- Pro Annual$19.991 Year
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- Pro Annual$29.991 Year
- Pro Annual2 variants$39.991 Year
- Pro Annual$49.991 Year
- Pro Annual$79.991 Year
- Pro Lifetime$59.99
Mailbox
- Unlock Unlimited$4.99
Questions
Is OLM Converter · Viewer, Reader free?
Is Mailbox free?
Do OLM Converter · Viewer, Reader or Mailbox have ads?
Which is updated more often, OLM Converter · Viewer, Reader or Mailbox?
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