Doesn't Work Rated 1 out of 5 stars

Thunderbird won't import the export, which seems like a pretty simple test. Here's the email I sent to the developer for background ((s)he did not reply):

I am having a problem with ImportExportTools for Thunderbird. When I export a bunch of folders, then reimport them into my "Local Folders", it's all messed up. I have a Gmail account with IMAP (many folders which are my Gmail labels; not worried about duplicate copies of messages, space is cheap). I CTRL+click to chose the folders I want to export (all of my label folders) and export them. When I reimport, under local folders, it is not the same. Folders have different unread counts and there are garbled messages with nonsensical dates. Have you ever seen this problem? Am I using your tool wrong? Do you want more information?

Background: I am trying to make a dump of my Gmail. I have setup Thunderbird with Gmail over IMAP and have downloaded everything including attachments. I can disconnect from the network and open messages and attachments. Then, I use ImportExportTools as I described.

ImportExportTools v2.7.0.1
Thunderbird v3.1.19
Running Ubuntu 11.04 Natty x64.

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