Ms Exchange vs dovecot

[Marc Roos]

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?

 1. public folder can be implemented with a public mailbox?

 2. 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' 

 3. 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?