A private OLM viewer that runs in your browser

What it shows

Drop an .olm file on this page and you see what Outlook for Mac put in it:

• Folders, with how many messages each holds: Inbox, Sent Items, your own folders and sub-folders, per account, plus anything kept “On My Computer”.
• Messages, with sender, recipients, date and the formatted text, shown the same way as every other email on this site: in a sealed frame where nothing in the email can run, and with pictures from the internet held back until you ask.
• Attachments, each with a Save button. Pictures used inside a message are listed separately. If Outlook left an attachment out of the archive (it sometimes does for files it never downloaded), the message says so.
• Contacts and calendar, counted, so you know they’re there and can export them.

Why in the browser

Most .olm viewers are Windows programs to download and install, or websites that ask you to upload the archive, which is your entire mailbox. Mailunwrap reads it in your browser instead. Nothing is uploaded, nothing is installed, and it works the same on Windows, macOS, Linux and ChromeOS.

Archives are often big. The page reads the archive’s index first, so the folder list appears quickly, and then reads only the messages you open. An archive of several gigabytes doesn’t have to fit in memory.

Free and paid

Reading the first 10 messages of an archive, with their attachments, is free. The one-time £6 unlock adds browsing every folder, searching by subject, sender, recipient or folder, and exporting: the whole archive (or one folder) as .mbox files for other mail programs, as .eml files, or as PDFs, plus contacts as vCard and CSV and the calendar as .ics.

Good to know

• Outlook for Mac’s archive format isn’t published by Microsoft. Mailunwrap’s reader has been checked against archives made by Outlook for Mac itself, from 2018 and 2026 versions, but Outlook has many versions and settings. If something in your archive doesn’t show the way you expect, your original Outlook for Mac remains the reliable fallback.
• Outlook stores times in UTC; they’re shown in your own time zone. Exported calendar events keep the time zone each event was made in, so a weekly 9:00 meeting stays at 9:00 when the clocks change.
• Tasks and notes in an archive aren’t shown or exported yet.