A client hit me with a good question: They have an existing MOSS 2007
installation initially set up with everything using one domain. They
have since moved some of the users from the original domain to a new
domain. The MOSS server can see the new domain, but of course, none of
the original information about the users has been maintained.

Is there any way to tell SharePoint 2007 that DOMAINOLD\user is now
really DOMAINNEW\user? I'd really like to keep all the existing
properties and permissions without having to go back in and set up
DOMAINNEW\user as a new user.