I have a domain running Windows 2000 SP4 DCs and an Exchange 2000 SP3 server. I am getting ready to introduce a Windows 2003 R2 DC into the environment. I know I need to update the schema on the DCs - but do I need to do the InetOrgPerson fix on the Exchange server? I thought SP3 fixed that issue. I done my homework but can't find a definitive article on the issue. Thanks! Bret Hanson Systems Administrator Yunker Industries, Inc.