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Export files from OE to OutlookĪssuming you have Outlook installed on your system, open Outlook Express and from the File menu select Export/Messages. If Outlook Express is your email client of choice you don't have to perform the next step. Open Windows Explorer or your favourite file manager, locate the generated eml files, select them and drag and drop them into the OE application window. Launch Outlook Express and select the local folder (or create a new one) into which you want to import your messages. Import generated eml files into Outlook Express you can convert multiple mbox files at once. Click "Convert" and IMAPSize will start converting the files.Īll the attachments will also be converted and your original Thunderbird files will not be touched. Select the mbox file you wish to convert (you might need to set the "Files of type" option to "All Files" in the file selection dialog, since Thunderbird mbox files don't have an extension) and select a location where generated eml files should be stored. Download, install and run IMAPSize (it's free) and invoke the mbox2eml option from the Tools menu. IMAPSize has a built-in mbox2eml tool that can seemlesly convert thousands and thousands of messages. INBOX.msf), which is the index (Mail Summary File) to the mail file. INBOX), which is the mail file itself (in "mbox" format), and one with an. Each mail folder (Inbox, Sent, etc.) is stored as two files - one with no extension (e.g. Thunderbird stores messages in the Profile Folder, in the Mail and (if you use IMAP) ImapMail folders. This will completely remove deleted messages from the folders mbox file. Right click a folder and select "Compact This Folder". If you don't want to include deleted messages in the conversion, you have to compact your folders in Thunderbird.
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Thunderbird keeps messages in mbox files even after they have been deleted. Compact your Thunderbird folders (optional)
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MS Outlook stores messages in *.pst files which are binary propriatory (Microsoft) files. Outlook Express stores email messages in propriatory *.dbx files but understands *.eml, which are plain text files. Mozilla Thunderbird stores emails in the mbox format. IMAPSize can be of great help in this process and this page explains how to perform the migration for free. However, Thunderbird still doesn't have an "Export" feature which would export mail archives in a format understandable by OE or Outlook. Even though Mozilla Thunderbird is a fantastic email client, there are people who (for one reason or another) need to switch back to Microsoft Outlook Express (OE) or Outlook.
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