So, today I have installed Mozilla Thunderbird 24.2.0 on my Windows 7 (64 bit) machine.
It was downloading emails, until it hit an error. An alert showed up saying : "There is not enough disk space to download new messages. Try deleting old mail, emptying the Trash folder, and compacting your mail folders, and then try again."
Now, disk space is not a problem, there is enough free space left ( almost 50 % of the drive ).
How to stop the alert and continue downloading ?