DOCUMENT:Q259541  01-JUN-2001  [exchange]
TITLE   :XADM: Store Hangs During Move Mailbox Process
PRODUCT :Microsoft Exchange
PROD/VER:winnt:5.5
OPER/SYS:
KEYWORDS:exc55 kbExchange550preSP4fix kbExchange550sp4Fix kbgraphxlinkcritical

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The information in this article applies to:

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

When you perform a Move Mailbox procedure (or shortly after), the source or
destination servers that are involved in the process may stop responding (hang).
Clients that attempt to log on cannot finish logging on, and e-mail messages do
not leave the Outbox for clients that are already logged on.

CAUSE
=====

This issue can occur because the information store regularly checks to determine
whether a specified user is involved in a move-user operation before the
information store allows certain activities (such as message delivery, or
logging on).

If no users are being moved, the check returns immediately with FALSE (this user
is not being moved).

If users are being moved, the information store enters a critical section object
and scans a list of users who are being moved to determine whether the specified
user is on the list. After information store scans the list, the thread exits
the critical section.

A specific condition exists, in which an information store thread enters a
critical section, but does not exit the critical section before the information
store thread returns from the function call. As a result, future threads that
attempt to check the list of users that are being moved stop responding while
the threads wait to enter the critical section object.

RESOLUTION
==========

To resolve this problem, obtain the latest service pack for Exchange Server 5.5.
For additional information, click the following article number to view the
article in the Microsoft Knowledge Base:

   Q191914 XGEN: How to Obtain the Latest Exchange Server 5.5 Service Pack


The following files are available for download from the Microsoft Download
Center:

   x86: DownloadDownload Q248838engi.exe now
   (http://www.microsoft.com/downloads/release.asp?ReleaseID=25443)
   Alpha: DownloadDownload Q248838enga.exe now
   (http://www.microsoft.com/downloads/release.asp?ReleaseID=25444)

For additional information about how to download Microsoft Support files, click
the following article number to view the article in the Microsoft Knowledge
Base:

   Q119591 How to Obtain Microsoft Support Files from Online Services

Microsoft scanned this file for viruses. Microsoft used the most current
virus-detection software that was available on the date that the file was
posted. The file is stored on secure servers that prevent any unauthorized
changes to the file.


STATUS
======

Microsoft has confirmed that this is a problem in Microsoft Exchange Server
version 5.5. This problem was first corrected in Exchange Server 5.5 Service
Pack 4.


Additional query words:

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Keywords          : exc55 kbExchange550preSP4fix kbExchange550sp4Fix kbgraphxlinkcritical 
Technology        : kbExchangeSearch kbExchange550 kbZNotKeyword2
Version           : winnt:5.5
Issue type        : kbbug
Solution Type     : kbfix

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Copyright Microsoft Corporation 2001.