Learning Exchange Server 2003 by William Boswell [Repost]

Surprisingly, the majority of organizations running Exchange are still usingExchange 5.5 that was released in 1997. In 2003, Microsoft suspended theirsupport of 5.5. Companies are now starting to upgrade and they will upgradeto 2003.Most sys admins who call themselves "Exchange" admins have never reallyworked with Exchange servers before.