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Event ID: 13005 Source: MSExchangePOP3

Level
Description
Logon attempt by <server\username> from <IP address> to <server\username> has failed: <function> call failed with error: <error message>
Comments
 
- Function: EcGetMailboxDN(), error: "Ambiguous Alias" - I have found this event occurs when the mailbox alias is not the same as the username being used to log on to it. Exchange assumes that the alias and username match and if this is not the case, this error is reported.
To resolve this, in Outlook Express, or other POP3 client, specify the username in the following manner:

domainame\username\mailbox_alias

Therefore, for user Gandalf in domain Fellowship wanting to connect to a mailbox with the alias RingSightings, the following should be used:

Fellowship\Gandalf\RingSightings

This works for me and I hope it helps you.
- Function: EcQueryRows(), error: "Unspecified error" - See ME298836.
- Function: EcGetMailboxDN(), error: "The requested mailbox is not available on this server" - See ME198704.
For more info see ME199274. Also check ME161118 for troubleshooting POP3 connections to Exchange Server.
Function: EcGetMailboxDN(), error message: "The requested mailbox is not available on this server". The mailbox is moved to another server under same exchange server site.

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