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There are a variety of possible causes for 80004005:
The default Web site on the server doesn't contain a blank Host header. (http://support.microsoft.com/default.aspx?scid=kb;en-us;Q282076)
The default Web site on this server is using the wrong network adapter IP address.
(http://support.microsoft.com/default.aspx?scid=kb;en-us;Q285643)
The Exadmin virtual directory is configured to require SSL.
(http://support.microsoft.com/default.aspx?scid=kb;en-us;Q279863)
You apply the folder traversal vulnerability patch (MS Security Bulletin MS00-078) but don't have Windows 2000 SP2 installed. (http://support.microsoft.com/default.aspx?scid=kb;en-us;Q280806)
For general troubleshooting of this error, see http://support.microsoft.com/default.aspx?scid=kb;en-us;Q289492 and http://www.microsoft.com/exchange/using/tips/Svr_80004005.asp.
Also, when in a Windows 2000 mixed-mode domain, make sure you only use Universal Security Groups (USGs) for client permissions. If you use a Universal Distribution Group (UDGs), Exchange tries to convert the UDG to a USG. Because USGs are only available in native-mode, only native-mode domains can perform this conversion. If your Windows 2000 domain is in mixed-mode, you'll get error 80004005. (http://support.microsoft.com/default.aspx?scid=kb;en-us;Q274046).
As for 80040e09, log on as the Exchange 5.5 service account and try the function again. If it works, launch Exchange System Manager and run the Exchange Delegation Wizard and grant your account (and other desired accounts) permissions.
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