Windows 2000 in place upgrade issues

Windows Server 2003 adprep /forestprep Command Causes Mangled Attributes in Windows 2000 Forests That Contain Exchange 2000 Servers

One of our engineers uncovered this gem doing R&D for an in-place upgrade of a Windows 2000 AD Forest that contains Exchange 2000.

This KB article documents how to prevent 'mangled' Exchange 2000 AD objects and how to repair them if you perform an upgrade without renaming the attributes first. I prefer to avoid the term 'unmangle' even though it sounds cool.