This must be basic... but can't figure it out. Set mailbox-enabled user in AD. Then set Outlook XP to access Exchange... can resolve username, but then asks for username, password, and domain... enter the right ones and "your logon information was incorrect" keeps poping up... cannot access Exchange mailbox. Have easily read entire mskb and Technet and still can't figure it out. Any ideas? (Do I need to "initialize" mailboxes or something of the sort somewhere?). Heeeeelppp! :)