Comment 12 for bug 2060534

> It's not about the actual size of total free disk space, but maybe due to not being able to open such a large file in the current folder OR RAM not being able to handle such a large file.

I understand that there could be many reasons a failure, but regardless of the reason - the temp file should be deleted afterwards.
In fact, it should probably be cleared on startup as well if it's there.

I ran into a problem where the indexing process kept getting stuck on message 25 of many thousands in some folder.
I backed up the profile and cleared the imap mail directory and allowed Thunderbird to download everything again.
Manual compacting finishes for Sent items without an error (I was never able to reproduce it manually).
However, indexing still gets stuck on the same folder. The Error Console does not show anything that is obviously related (see attachments).