Support

Outlook data files (.pst from Outlook 2003 and later, tested with 2003–2013-era files; older Outlook 97–2002 “ANSI” files are supported through libpff), offline Outlook files (.ost from classic Outlook 2013 and later), MBOX files, single .eml files, and folders of them, such as an Apple Mail export. You don’t need Outlook or a Microsoft account.

An OST is Outlook’s local copy of a mailbox. Items Outlook never downloaded (for example with a “keep the last 12 months” setting) aren’t in the file; Mailcellar says “No message text” for them. The new Outlook for Windows doesn’t make OST files.

Old ANSI PSTs and some MBOX messages don’t say which character set they use. Choose Message › Text Encoding and pick the language the mail was written in (for example Cyrillic or Japanese).

When you open an archive, Mailcellar lists every message and then indexes the text in the background; big archives keep working while it does. Search by sender, subject or message text, between dates, in one folder or all of them.

Selected messages, a whole folder or search results, as EML files, one MBOX mailbox, a PDF (every message on its own page with its headers and page numbers) or a CSV list of the headers. You can also save attachments one at a time, all of a message’s, or all of a folder’s.

Opening, browsing, reading, search and Quick Look are free with no limit. Without a key, exports and attachment saving work 10 messages or attachments at a time; Pro removes the limit. It’s a one-time purchase on Gumroad, with no subscription.

Choose Mailcellar › Settings…, open the Pro tab, paste the key from your Gumroad receipt and click Activate.

Mailcellar checks for updates on its own; you can also choose Check for Updates… from the Mailcellar menu. Updates are free.

Gumroad handles payment. Reply to your Gumroad receipt or email help@fitztoppicks.com.

No. One license key works on up to 3 of your Macs. Download the app again from your Gumroad receipt or library and enter the same key.