DOCUMENT:Q192514  29-APR-1999  [exchange]
TITLE   :XFOR: DXA Appends 001 at End of Display Name in MS Mail GAL
PRODUCT :Microsoft Exchange
PROD/VER:WinNT:5.5
OPER/SYS:
KEYWORDS:exc55sp2fix

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The information in this article applies to:

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

The directory synchronization service (DXA) appends the characters 001 at the
end of the user's display name when performing directory synchronization between
Exchange Server and Microsoft Mail under the following conditions:

 - Deletion and creation of mailboxes with the same name occur in the same cycle
   of the dirsync.

 - Delete transaction reaches the dirsync server before add transaction.


CAUSE
=====

When the above steps are performed, the code compares the full name of the added
user with that of the deleted one and decides that the display name needs to be
unique. The postoffice comparison fails because the deleted user's e-mail
address is a NULL string, and the code is not handling this condition correctly.
As a result, 001 is appended at the end of the display name in the GAL.

RESOLUTION
==========

To resolve this problem, obtain the latest service pack for Exchange Server
version 5.5. For more information, please see the following article in the
Microsoft Knowledge Base:

   Q191014 XGEN: How to Obtain the Latest Exchange Server 5.5 Service Pack


The English version of this fix should have the following file attributes or
later:

   Component: DXA

   File Name   Version
   ----------------------
   Dxa.exe     5.5.2393.0


STATUS
======

Microsoft has confirmed this to be a problem in Microsoft Exchange Server
version 5.5.

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

The problem described above is relevant only in cases where the following
registry entry is "0":

   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeDX
   \Unique Display Names

For more information about this registry entry, see the following article in the
Microsoft Knowledge Base:

   Q166545 XFOR: Exchange 5.0 DXA Appends 001 Only When Needed

This article states that when the Unique Display Names registry entry is 0, 001
is not appended if NETWORK/PO is different, even when a user with the address
type of MsMail and the same name is dirsynced. However, if dirsync is performed
under the conditions in the SYMPTOMS section above, 001 will be appended at the
end of the display name.
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Keywords          : exc55sp2fix 
Technology        : kbExchangeSearch kbExchange550 kbZNotKeyword2
Version           : WinNT:5.5
Issue type        : kbbug
Solution Type     : kbfix

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