1. Abstract

   The IMAP4 specification [RFC-2060] describes a rich protocol for use
   in building clients and servers for storage, retrieval, and
   manipulation of electronic mail.  Because the protocol is so rich and
   has so many implementation choices, there are often trade-offs that
   must be made and issues that must be considered when designing such
   clients and servers.  This document attempts to outline these issues
   and to make recommendations in order to make the end products as
   interoperable as possible.