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Maildir is an email storage format used by popular email clients like kmail.
Email clienst supporting maildir
kmail supports maildir natively, probably since its inception.
Evolution supports Maildir.
Mutt supports Maildir.
Thunderbird does not support maildir even though it has a pluggable store extention named "Maildir". The official documentation1 warns:
This is NOT full maildir in the sense that most people, particularly linux users or mail administrators, know as maildir. You cannot point a Thunderbird account to a mail server directory. You do not get message flags stored with emails. You only get a single file per message, and nothing more.
Claws Mail has a maildir plugin, but it's slow and unmaintained.
- Wikipedia: Maildir.