Hi Timo,
I'm reading/thinking about the direction you're headed, but had a question...
Here you say:
The ~/Maildir/shared directory could then contain symlinks to all the shared mailboxes. The directory list could probably be in Maildir++ layout even though the symlinks would point to mboxes.
Why would the symlinks point to mboxes? Is it required for shared mailboxes to be in mbox format? If so, I'm confused - didn't you say that the support for Public Shared folders in maildir format should work?
Or would this only apply to each Users Shared folders? If so, why? (please don't misunderstand, I'm not contradicting you, but I'm curious)...
Lastly, are you contemplating adding support for Client-side control of the ACLs for the users Shared folders? I'm not sure about anyone else, but I don't give my users shell access, so they wouldn't be able set these up themselves...
Thanks for sharing your thoughts out loud...
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Best regards,
Charles