For some reason, I was under the impression that cross-domain busy search does not currently work. Unfortunately, I cannot find mention of that in the forums or bugzilla (tho' it could be my weak searching skills).

Basically, what I'm wanting to know is, if there are two companies that share an LDAP installation (e.g. master in one location, replica in another), with each having their own MTA and Store, and using different domains... can you busy search across that?