Rated 4 out of 5 stars

Thank you very much for ImportExportTools. Its excellent addon, brillant and helpful.

I'm using that "export of all messages in one single plain text file" the feature. It's very thing, all mail combining is a TXT file.

I have three request-suggest.

(1. Request)

By way of my habit of O.Express, I have been backup all mail. OE's headers sequence:

From:
To:
Subject:
Date:
Attachements: filename1.txt, photo2.jpg

ThunderBird's Header sequence not same with OE. Therefore, ImportExportTools use TB sequence:

Subject:
From:
Date:
To:

Could you adding OE sequence? At least, a custom sequences as a option?

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(2. Request)

About Date display format (http://kb.mozillazine.org/Date_display_format).

I'm set prefs.js file: user_pref("mail.ui.display.dateformat.default", 1);

After this setting, ThunderBird can display as "Day-Month-Year-Hour" date format of all mails. Example: 8 July 2013 20:00

Unfortunately TB can't remember the date format setting when saving (File - Save As - File). Still use save default format("Date: 08.07.2013 20:00")

Even if the date format supplied by TB, ImportExportTools can change/fix in saved mails?

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(3. Request)

ImportExportTools perfectly merge all mails "as single plain text". Okay. But no separating line of every mails. Therefore reading can be confusing. Could you add a custom separating character? (etc "-----" ).

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You see, that's all not important. Perhaps, its personal request. If it comes to that and unnecessary for general use, of coure you could take no notice of this suggestions.

At all events, again thank you for ImportExportTools.
Best regards...

This review is for a previous version of the add-on (2.8.0.4). 

About your requests:

1) This requires some work to be implemented and at the present it's not one of priorities. I've not so much time to develop the extension and so I must do a "order of priority". I will keep this in mind for the future, if I will have time enough.

2) Are you talking about headers in saved messages or what else?

3) This is a very useful hint, it will be implemented in the next update.