Exchange Server
AUTOCOMPLETE IN OUTLOOK 2000 FAILS WHEN MOVED TO EXCHANGE SERVER
Outlook needs to know whether or not autocomplete should match from the local client contacts or the Global Address List on the Exchange Server.
Click TOOLS, SERVICES to bring up the Services dialog box. Click the ADDRESSING tab. Use the following values for Outlook 2000 connected to MS Exchange email server with Global Address List:
Show this address list first: Global Address List Keep personal addresses in: Contacts When checking mail, che...: Global Address List (first) Contacts (2nd)
If the user doesn't use local contacts or doesn't care about local contact autocompletion then remove local contacts from the 3rd.
Groups in Exchange
Global groups, in which all the users must come from the same domain.
Domain local groups, in which members can be drawn from any domain in the forest, but permissions can only be granted to the local domain (that is, the domain where the group account resides).
Universal groups, in which members can be drawn from any domain in the forest and be granted permissions anywhere in the forest.
ref: Group Scope