There are a couple ways to do this, including using LDIFDE (LDAP Data Interchange Format Directory Export) or CSVDE (CSV Directory Export). See Step-by-Step Guide to Bulk Import and Export to Active Directory and How to Use Csvde.exe to Import Contacts into Active Directory for details on how to use these tools. Also, see HOW TO: Create Mailbox-Enabled Accounts Using LDIFDE in Exchange 2000 Server in case you are also working with Exchange 2000.
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