DOCUMENT:Q186043  12-APR-1999  [exchange]
TITLE   :XCON: ECB Usage Count Events Appear with Large Directories
PRODUCT :Microsoft Exchange
PROD/VER:WINDOWS:5.5
OPER/SYS:
KEYWORDS:

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The information in this article applies to:

 - Microsoft Exchange Server, version 5.5 
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SYMPTOMS
========

When you send a message to a Microsoft Exchange Server computer with a directory
that contains an extremely large number of mailboxes and distribution lists,
numerous 9405 events may appear in the event log with a source of MSExchangeMTA.
These events indicate that the problem is related to the number of entity
control blocks (ECBs) that are being used. This problem can also occur when you
perform directory replication with a directory that contains an extremely large
number of mailboxes and distribution lists.

CAUSE
=====

This problem occurs because the ECB usage count is maintained incorrectly.

STATUS
======

Microsoft has confirmed this to be a problem in Microsoft Exchange Server
version 5.5. This problem has been corrected in the latest U.S. service pack for
Microsoft Exchange Server version 5.5. For information on obtaining the service
pack, query on the following word in the Microsoft Knowledge Base (without the
spaces):

   S E R V P A C K


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Keywords          :  
Technology        : kbExchangeSearch kbExchange550 kbZNotKeyword2
Version           : WINDOWS:5.5
Issue type        : kbbug
Solution Type     : kbfix

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