Archive from any IMAP account.
Exchange is supported for Apple Mail, and Microsoft Entourage and Outlook.
You can archive Gmail via your mail client or directly.
Mail Archiver X can archive mbox files without any mail client. For instance, even if you can't use Eudora on Lion anymore Mail Archiver X can import old mbox files from Eudora.
The built-in browser has the familar 3-pane interface of every mail client.
There are 2 main formats: the internal database and - if you have a Filemaker license - a free and open Filemaker template. If you archive to the internal database you can export the complete or partial data to Evernote, Filemaker, PDF, mbox, Text (csv), or XML.
Each format has options to tailor the export to your needs. The screenshot shows the options for exporting to PDF.
Filemaker versions 12-15 are supported. Part of Mail Archiver X is a Filemaker database, that can be used for archiving mails.
It's just a bit annoying to remember to do something. Archive daily, weekly, monthly or once a quarter.
Any questions that this page didn't solve? Go to Moth Software support and ask.
Download a FREE trial of Mail Archiver X:
Version: 4.1 beta 3