Microsoft KB Archive/198143

= XFOR: Unique Alias Name Required for POP3/IMAP4 Client Logons =

Article ID: 198143

Article Last Modified on 10/25/2007

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APPLIES TO


 * Microsoft Exchange Server 5.5 Standard Edition
 * Microsoft Exchange 2000 Server Standard Edition
 * Microsoft Exchange Server 2003 Standard Edition
 * Microsoft Exchange Server 2003 Enterprise Edition

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This article was previously published under Q198143



SYMPTOMS
POP3 users are may not be able to log into their mailboxes. The following error may be returned:

The requested mailbox is not available on this server.



CAUSE
The alias for each user's mailbox is the same on the mailbox property's general page. Further diagnosis will show the following:

The accounts for the clients are

SITE1/user with an SMTP address of user@site1.org.com

SITE2/user with an SMTP address of user@site2.org.com

Two Windows NT domains are DOM1 and DOM2, and the two Exchange Servers, ORG/SITE1/Server1 and ORG/SITE2/Server2, respectively.



WORKAROUND
To work around this problem, the Administrator needs to assign unique aliases for every user. While the address user@site1.org.com is unique in the case of SMTP protocol, it is not unique when a POP3 or IMAP4 client logs on. The duplicate alias of 'user' will result in the above error.

Additional query words: ambiguous unique telnet

Keywords: kbprb KB198143

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