Q: Do I need CDO patch for Exchange 5.5 if I decide to run outlook tool from client A: Exchange 5.5 is past the end of its support lifecyle. If you are running Exchange Server 5.5, contact the Microsoft account manager or the Technical account manager
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Read the complete post at http://blogs.technet.com/dst2007/archive/2007/03/01/do-i-need-cdo-patch-for-exchange-5-5-if-i-decide-to-run-outlook-tool-from-client.aspx