My, my, did not expect this discussion. It is our own fault we are stuck with google and microsoft monopolies. If small companies would combine effort (resources and cash) and would not reinvent/create the wheel constantly on our own little islands, we would have much better products. So respect for the dovecot team.
The reason I am asking is that, the public folder solution is not as it was in 2000. Exchange 2016+ do not support CDO etc. Nobody transitioned between the two?
public folder can be implemented with a public mailbox?
authorize users via groups access to mailboxes/folders of the public folder/mailbox. I think I saw ACL's with dovecot, does this compare to 'folder permissions'
is it possible with sieve to apply a rule on any mailbox/folder? Thus if I 'drag' a message to a folder, the sieve rule is activated?