Password Credentials Error In Outlook Express

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There could be logon credential problem when you log on to your mail server, MS Exchange Server for using Outlook Express. When you connect to Exchange Server 5.0, 5.5, or Exchange 2000 to send or receive mail in Outlook Express or may be even Outlook, you repeatedly receive a prompt for credentials. With Outlook Express, you get the following list of errors which add to the misery of lost email connection.
The message could not be sent because the server rejected the sender's e-mail address. The sender's e-mail address was email address, Subject, Account: Server: Protocol: SMTP, Server Response: '454 5.7.3 Client was not authenticated.' Port: 25, Secure (SSL): No, Server Error: 454, Error Number: 0x800CCC78
The message could not be sent because the server rejected the sender's e-mail address. The sender's e-mail address was Email address Subject Account: Server: Protocol: SMTP, Server Response: '505 Authentication required', Port: 25, Secure (SSL): No, Server Error: 505, Error Number: 0x800CCC78
There was a problem logging onto your mail server. Your User Name was rejected. Account: Server: ' Protocol: ...
... POP3, Server Response: '-ERR Clear text passwords have been disabled for this protocol', Port: 110, Secure (SSL): No, Server Error: 0x800CCC90, Error Number: 0x800CCC91
Reason behind these strings of errors
It might be due to some wrong authentication settings. The Exchange Server computer has been set to only allow Integrated Windows Authentication.
Resolution
Go with the following steps and you would be able to resolve this issue. If you cannot receive messages properly in Outlook Express or Outlook 2000 Internet Mail Only:
1.Start Outlook 2000 or Outlook Express, and click Accounts on the Tools menu.
2.In the Internet Accounts dialog box, click the Mail tab.
3.Click your mail account, and then click Properties.
4.Click the Servers tab, and then click to select the Log on using Secure Password Authentication check box under Incoming Mail Server.
If you cannot send messages properly in Outlook Express or Outlook 2000 Internet Mail Only:
1.Start Outlook 2000 or Outlook Express, and then click Accounts on the Tools menu.
2.In the Internet Accounts dialog box, click the Mail tab.
3.Click your mail account, and then click Properties.
4.Click the Servers tab, and then click to select the My server requires Authentication check box under Outgoing Mail Server.
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