Ms Exchange vs dovecot

[Marc Roos]

I have recently been working/testing with exchange 2016 and started 
thinking if I should even migrate to this platform. I assume more people 
here have experience with exchange and this idea.


I was wondering if this is possible with a dovecot setup

 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?