Mulberry was my mail app of choice back circa 1998. At the time, it was verifiably the most complete implementation of IMAP available. It supported server-sid

Mulberry was my mail app of choice back circa 1998. At the time, it was verifiably the most complete implementation of IMAP available. It supported server-side searching, server-side copying, shared mailboxes, and I believe partial fetch. All features that no other IMAP client supported at the time. Some of these feature were even difficult to find in server implementations.