DOCUMENT:Q298836  16-AUG-2002  [exchange]
TITLE   :XIMS: Exchange Server 5.5 Generates Error Messages
PRODUCT :Microsoft Exchange
PROD/VER::5.5,5.5 SP1,5.5 SP2,5.5 SP3,5.5 SP4
OPER/SYS:
KEYWORDS:exc55 exc55sp1 exc55sp2 exc55sp3

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The information in this article applies to:

 - Microsoft Exchange Server, versions 5.5, 5.5 SP1, 5.5 SP2, 5.5 SP3, 5.5 SP4 
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SYMPTOMS
========

If a Post Office Protocol version 3 (POP3) or Internet Message Access Protocol,
Version 4rev1 (IMAP4) client polls an Exchange Server 5.5 mailbox that contains
more than 65,535 messages, the client session may either time out, or the user
may receive an error message.

In addition, the following event will be logged in the application event log on
the server:

   Event ID: 13005
   Event Source: MSExchange Pop3 Interface
   Event Category: Authentication
   Event Type: Error
   Description:
   Logon attempt by DOMAIN\user from 127.0.0.1 to domain/mailbox has failed:
   EcQueryRows() call failed with error Unspecified error.

CAUSE
=====

Microsoft Exchange Server 5.5 does not support using a POP3 or IMAP4 client to
read mailboxes containing more than 65,535. This is a known design limitation.

WORKAROUND
==========

To work around this problem:

 - Either use a MAPI client to read the mailbox or install mailbox agents or
   event sinks to process and remove mail in real time. If you do so, you avoid
   the possibility of a mailbox reaching this size limit.

-or-

 - Upgrade to Microsoft Exchange 2000 Server; this problem has been resolved in
   Exchange 2000.

STATUS
======

Microsoft has confirmed that this is a problem in Microsoft Exchange Server
version 5.5.

MORE INFORMATION
================

If you establish a POP3 session through Telnet to the Exchange Server and
connect to a mailbox with more than 65,535 items in the inbox, you may receive
an error message similar to the following after you issue the pass command:

   telnet <server> 110
   +OK Microsoft Exchange POP3 server version 5.5.2655.20 ready

   user domain\user/mailbox
   +OK

   pass <password>
   -ERR Unspecified error

Additional query words:

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Keywords          : exc55 exc55sp1 exc55sp2 exc55sp3 
Technology        : kbExchangeSearch kbExchange550 kbZNotKeyword2 kbExchange550SP1 kbExchange550SP2 kbExchange550SP3 kbExchange550SP4
Version           : :5.5,5.5 SP1,5.5 SP2,5.5 SP3,5.5 SP4
Hardware          : x86
Issue type        : kbprb
Solution Type     : kbnofix

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