This error may appear when you try to log on to Microsoft Exchange Server with Outlook Express by using Secure Password Authentication.
“Server Error: 0×800ccc90, Error Number: 0×800ccc18″
Either the Outlook Express POP3 client is not able to access the mailbox because it does not exist or there is a custom recipient in the Exchange Server organization that has the same alias as you do, and Exchange Server is attempting to access the custom recipient before accessing your mailbox.
To fix these errors you should try to use Clear Text in Outlook Express.
To do so follow these steps:
Step 1: Go to Tools, click on Accounts. This will bring up several tabs.
Step 2: If you select any listed mail account, the Properties will have a Servers tab with the Log on using option.
Step 3: Select the Clear Text option.
If this works, then you were trying to access a non-existent mailbox or the wrong mailbox. If this does not work, then the administrator needs to check for and remove the custom recipient.
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