Thanks for your help, but now I have some questions about exactly what you are showing me.

One, in the EXEC sp_addlinkedserver command, do I run the command just as you wrote it or are there some things that will be specific to my environment?

Two, can you tell me where I might find more information about the LDAP string in the query? I am trying to figure out what to put in it for my environment so I need to know what it is looking for.