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Directory Access

Legacy MAPI client software (prior to Outlook 2000) doesn't keep Directory Service location information in the messaging profile. Because of this, legacy client software will always look to the server that hosts the user's mailbox for directory lookups. This is not an issue if the Exchange 2000 server also happens to be a Global Catalog (GC) server. A normal lookup will occur because AD supports MAPI Directory Services (DS). DSProxy will handle the directory requests from legacy client software in the event that the Exchange 2000 server is not also a GC server. Client software requires access to the AD for Address Book lookup and name resolution.

DSProxy—Directory Services Proxy. DSProxy is used to query the active directory on behalf of legacy software clients. Outlook 2000 can maintain DS information and therefore does not use DSProxy.

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