Background
Issue
After creating an Exchange 2003 (MAPI) connection and while testing delegate full access (Impersonation), the following error is received:
Connection Test Failed: Error in IMsgServiceAdmin::ConfigureMsgService: WSAECONNRESET
Resolution
Exchange 2007 / 2010
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Open the Exchange Management Console, and expand Recipient Configuration, Mailbox.
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Right-click your User mailbox, and select Properties.
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In the General tab, ensure that the Hide from Exchange address lists check box is cleared.
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Select OK.
Exchange 2003
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From the Microsoft Exchange All Programs group, open Active Directory User and Computers.
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Navigate to your User, and select Properties.
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Select the Exchange Advanced tab, and ensure that the Hide from Exchange address lists check box is cleared.
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Click OK.