</term>
<listitem>
<para>
-A mailbox format in which all mail is kept in separate files.
+A mailbox format in which all mail is kept in separate files. Maildir++ is an extension to the maildir format.
</para>
</listitem>
</varlistentry>
</term>
<listitem>
<para>
-A mailbox format in which all mail is concatenated and stored in a single file.
+A mailbox format in which all mail is concatenated and stored in a single file. The mbox format supported by Sylpheed-Claws is mboxrd.
</para>
</listitem>
</varlistentry>