The following error messages may appear in the Outlook client when the RPC registry entries are missing or corrupted:
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The name could not be resolved. The Microsoft Exchange address book was unable to logon to the Microsoft Exchange Server computer.
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Outlook could not logon. Check to make sure you are connected to the network and are using the proper server and mailbox name.
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The name could not be resolved. Network problems are preventing connection to the Microsoft Exchange Server computer. Contact your system administrator if this condition persists.
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Your logon information was incorrect. Check your username and domain, then type your password again. If your account is new or if your administrator requested a password change you need to click Change Password then logon with your new password.
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Cannot Start Microsoft Outlook. The attempt to log on to the Microsoft Exchange Server computer has failed.
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The server containing the global address list is no longer available. You can reconnect to a different server by restarting Outlook or retry the operation when the server is reachable.
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The connection to the Microsoft Exchange Server is unavailable. Outlook must be online or connected to complete this action.Praveen KumarMCTS | Exchange Server