Comment 149 for bug 275471

I can confirm this bug is still present in the latest Thunderbird 5.0 relese to date.

1. First open a new email with 6MB attachment -
2. Notice long download, no message body until complete. (either blank or previously selected message body often still visible).
3. Right click attachment - save as - long download, progress bar visible and the attachment is re-downloaded from the IMAP server.
4. Click on a different email.
5. Click back on the 6MB attachment email again.
6. Repeat 2-5

Problems / Correct Behaviour:
1. Attachments should not download before the body.
2. Large attachments (as selected) should (optionally) only download when requested.
3. Attachments should be retained locally
4. When saving a downloaded attachment the local copy should be saved ~instantly.
5. When reselecting an email with an attachment, it should use the local attachment copy.

*In summary - an attachment should in ALL CASES be downloaded ONLY ONCE.*

However the backend is implemented, this is what the user should experience. There seems no sane reason to redownload attachments ever apart from perhaps coming up against some set limit for local cache size.

3.