The clients must type passwords in plain text. Yes, it's insecure, but it's actually what most existing clients do anyway. Local deadlock avoided between membership and other modules. More changes to replication. Now supports dynamic replica addition and removal.
Some bug fixes to membership and failure recovery.
Preliminary multiple mailbox support. I tested using it using Aeromail . Solidified the replication code. Better IMAP support. Especially sys-flags modification supported in replicated mailboxes.