Quote:
Originally Posted by jolf.poder
in an effort to clean our Active Directory we used ADSIEdit to remove as much of the Exchange data as possible including the two test servers that had been installed and configured on the wrong network.
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You are running Exchange 2010 with no service pack, or you have recently upgraded to 2010 sp1. Your Outlook 2003 client is unable to connect to your Exchange server giving one of the below error messages:-
• The action could not be completed. The connection to the Microsoft Exchange Server is unavailable. Outlook must be online or connected to complete this action.
• The name could not be resolved. The connection to the Microsoft Exchange Server is unavailable. Outlook must be online or connected to complete this action.
• Outlook could not log on. Check to make sure you are connected to the network and are using the proper server and mailbox name. The connection to the Microsoft Exchange Server is unavailable. Outlook must be online or connected to complete this action.
• The name could not be resolved. The action could not be completed.
• Your Server or Mailbox names could not be resolved.
Explanation
By default Exchange 2010 (no sp) requires that Outlook clients use encryption to connect to the server. If you have recently installed Exchange 2010 sp1 this setting is retained. Outlook 2003 by default does not use encryption.
Fix 1:-
You can disable the requirement for encryption on the Exchange server. From the Exchange Shell run the below command:-
Set-RpcClientAccess –Server Exchange_server_name –EncryptionRequired $False
Fix 2
Alternatively you can enable encryption on the outlook clients. Go to the control panel, mail, account settings and tick as shown below.
Fix3
To enable encryption on a number of computers you could use a custom group policy.