Hello,

this has already been posted to kdepim-users mailing list but they had no idea and suggested to post it in the KDE forums.
So here we go:

First I'd like to tell you how my KMail2/akonadi has been set up:
I've been using KDE/KMail since the year 2000 and had been always very
pleased with it. But then I switched to KDE4 and finally KDEPIM 4.7.4
as it went stable in Gentoo.

First migrating KMail1 to KMail2 failed and I had to do it manually,
i.e. import every single mail folder. Finally I had my old emails in
KMail2. Then I tried to recreate my mail accounts, POP3 and IMAP. POP3
is fine, IMAP a nightmare. I had to stop using IMAP as every email
that was moved by a filter reappeared in the inbox. This happened also
for almost every email I manually deleted or moved. I moved avway from
IMAP and use POP3 for it now.
Nevertheless KMail2 was usable since then (but it never got as
responsive as KMail1 had been). And I also thought that I don't have
problems.

Then Gentoo made akonadi 1.7.2 stable (had been 1.6.1) which I
installed and then my problems started. KMail2 was almost unusable.
Switching to another local folder took me tenth of minutes. Reading
emails was not possible as kmail2 only told me that it's "loading
content" (or a similar text).
I've searched the Internet (and I read forum.kde.org for
kmail2/akonadi bugs) but I couldn't find hints. They tell you to
remove the "Local folder" akonadi source and add it again. I also
guessed it might be a good idea to rebuild the components that use
akonadi and so I rebuilt kdepim-runtime, kdepimlibs and
kdepim-common-libs.

The result is that I have at least *three* local mail folders that are
*empty* which used to have hundreds of emails. Where are they?
I've read much about akonadi and they say that akonadi doesn't move
mails to its database/cache/whatever. Mails stay in the local folders.
But why are they gone? I've looked in the filesystem, but I can't find
them anywhere in ~/.local/share/{local-mail,.local-mail.directory} but
I can see them in ~/.local/share/akonadi/file_db_data

I now wonder how can I fix that?
Is it possible to move files from the akonadi folder to the local-mail
folder and how do I have to rename them?

Thanks a lot for your assistance in advance!
Please let me know if you need more info.

Best regards,
Andreas