Cathy Anderson just posted a nice article on the Exchange Team blog that the Exchange 2003 Technical Library was just updated with many changes:

The following topics are new:

The following topics have had major updates (for example: procedures changed, support policies changed, best practices guidance changed):

The following topics have had minor updates (for example: spelling errors corrected, URLs updated):

The following documentation downloads are new:

To read the most current version online of the Exchange Server 2003 documentation, see the Microsoft Exchange Server TechCenter. 

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The following documentation downloads have been updated: