Folders containing messages and subfolders

[Adam Tauno Williams]

> Does Cyrus IMAP support the ability to have folders that may contain both
> messages and subfolders?

Absolutely, yes.

> The tdlp.org 'MS Outlook to Unix Mailbox Conversion' MINI-HOWTO suggests
> that no Linux IMAP server using the Mailbox format supports this feature.

Cyrus doesn't use Mailbox.  Mailbox sucks and is ancient.

> Does Cyrus IMAP use the Mailbox format

No!

>  and, if so, does it therefore NOT
> support folders containing both messages and subfolders?

It supports just about everything you can conceive of doing with an IMAP
server.