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Folder Format
A message folder can be either in mbox or in maildir format. mbox saves all messages of a folder to one file, whereas maildir saves each message to its own file. maildir, which is the default format, can be considered more robust, but it can be slower on some file systems. If you are unsure, you should choose maildir.
Note that there is currently no feature in KMail that allows to convert between both formats automatically - but you can just move all messages from an old mbox folder to a new maildir folder or vice versa.
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Отсюда вывод - используйте формат maildir. Я не думаю, что только Kmail может хранить ящики в формате maildir.
