Download Microsoft Internet Security and Acceleration (ISA) Server 2000 RPC Filter Blocks Outlook Traffic from Computers Running Windows Server 2003 Service Pack 1 (SP1) from Official Microsoft Download Center

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Microsoft Internet Security and Acceleration (ISA) Server 2000 RPC Filter Blocks Outlook Traffic from Computers Running Windows Server 2003 Service Pack 1 (SP1)

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Outlook 2003 running on Windows Server 2003 Service Pack 1 cannot connect to an Exchange 2003 server through ISA Server 2000. This problem may also affect earlier versions of Outlook.