# PST & OST Viewer Upstairs — Email Archive Reader & Opener

> Email Archive Reader & Opener (iPhone/iPad app by Marcelo Henrique Souza da Silva.)

- Source: https://appshunter.io/ios/app/pst-and-ost-viewer-upstairs/id6821197120 (this page in markdown: same URL + `.md`)
- Developer: [Marcelo Henrique Souza da Silva](https://appshunter.io/developer/1797985039)
- Category: Productivity, Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: American English
- Released: 2026-10-26
- Data updated: 2026-11-10

## What is PST & OST Viewer Upstairs?

Upstairs opens Microsoft Outlook .pst and .ost mail archives, plus .mbox mailboxes from
Google Takeout or Apple Mail, and lets you read what's inside them, on your iPad and
your Mac, entirely offline.

You probably have one of these files. An export from a job you left, a Google Takeout
download of your Gmail, a backup from a computer you no longer own, an archive someone
handed you on a drive. It is full of things you might need, and nothing on your Mac or
iPad will open it.

Upstairs will.

BROWSE IT LIKE MAIL
Your folder tree, exactly as it was. Message lists with senders, dates and attachment
markers. A reading pane that renders the message the way it was written, formatting intact.

FIND ANYTHING
Full-text search across subjects, bodies, senders and recipients, with the matching words
highlighted in context. Search covers the whole archive, not just the folder you're looking
at, and accents are ignored so "cafe" finds "café".

GET THINGS BACK OUT
Export any message as a .eml file that opens in Mail, Thunderbird, or anything else. Save
attachments to disk. Export a whole folder at once.

BUILT FOR BIG ARCHIVES
A ten gigabyte file is not a problem. Upstairs memory-maps the archive and indexes it in
the background, so you can browse while it works.

NOTHING LEAVES YOUR DEVICE
This is the part that matters, and we mean it literally:

• Upstairs ships without network permission. Not "we promise not to upload". The app has
  no ability to open a network connection. You can verify that yourself by inspecting the
  app bundle.
• No account, no sign-in, no server. There is no database of you anywhere, because there
  is no server to hold one.
• No analytics, no crash reporting, no advertising identifiers, nothing.
• Remote images in messages stay blocked until you explicitly ask for them, so opening a
  five-year-old newsletter doesn't tell the sender you're still reading.
• Your archive is opened read-only. Upstairs cannot modify it even by accident.

WHAT'S SUPPORTED
Unicode .pst and .ost archives from Outlook 2003 and later, including compressed and
encoded archives. And .mbox mailboxes (the format Google Takeout uses for Gmail exports
and Apple Mail uses for its own), with Gmail's labels appearing as folders. The older
32-bit ANSI PST format from Outlook 97-2002 is not supported yet. Upstairs will tell you
clearly if you open one rather than failing silently.

FREE AND PREMIUM
Browsing and search are unlimited and free, forever. The free tier opens five messages,
enough to check the archive really is what you think it is. Premium removes that limit and
unlocks export.

Premium is a one-time purchase. There is no subscription. You buy it once, it covers your
Mac, iPad and iPhone, and it stays yours on devices you buy later. Most people open
Upstairs because they have one archive they need to get into, and charging a recurring fee
for a job you do once would be wrong.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Upstairs Premium | $19.99 | one-time |


## Is PST & OST Viewer Upstairs safe?

Not enough ratings yet to assess PST & OST Viewer Upstairs.

## Is PST & OST Viewer Upstairs legit?

PST & OST Viewer Upstairs appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for PST & OST Viewer Upstairs is 65 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0 — 2026-10-27

No release notes.

## Apps similar to PST & OST Viewer Upstairs

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [OST to PST Converter · Viewer](https://appshunter.io/ios/app/ost-to-pst-converter-viewer/id6782100037) | — | Free | Productivity |
| [PST Viewer – PST MSG EML MBOX](https://appshunter.io/ios/app/pst-viewer-pst-msg-eml-mbox/id6820516765) | — | Free | Productivity |
| [MSG Reader · Converter, Opener](https://appshunter.io/ios/app/msg-reader-converter-opener/id6777057114) | — | Free | Productivity |
| [Avira Password Manager](https://appshunter.io/ios/app/avira-password-manager/id1120055983) | 4.4 (536) | Free | Productivity |
| [Secrets - Password Manager](https://appshunter.io/ios/app/secrets-password-manager/id1591056366) | 4.6 (188) | Free | Productivity |
| [Syn](https://appshunter.io/ios/app/syn/id6461774561) | 5.0 (2) | Free | Productivity |

## More apps by Marcelo Henrique Souza da Silva

- [Sementes - Emagrecer e Dieta](https://appshunter.io/ios/app/sementes-emagrecer-e-dieta/id6742360808)
- [GlowApp - Devotional for Women](https://appshunter.io/ios/app/glowapp-devotional-for-women/id6755090001)

All apps by Marcelo Henrique Souza da Silva: https://appshunter.io/developer/1797985039

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-11-10.*