DOCUMENT:Q269588  08-MAY-2002  [exchange]
TITLE   :XADM: Heap Corruption in MAPI Causes MTA to Stop Responding
PRODUCT :Microsoft Exchange
PROD/VER::5.5
OPER/SYS:
KEYWORDS:exc55 kbExchange550preSP5fix kbExchange550sp4Fix

======================================================================
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The information in this article applies to:

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

The message transfer agent (MTA) may stop responding (crash) with a call stack
that is similar to the following:

   

   0514efcc 77f640fc 04930000 40530000 0514eff8 NTDLL!RtlpFindAndCommitPages+0xde
   0514f008 77f64830 04930000 000000b0 048b0588 NTDLL!RtlpExtendHeap+0x56
   0514f0d0 6fff1921 04930000 00000001 000000a8 NTDLL!RtlAllocateHeap+0x1ae
   0514f0f4 6fff1383 00000015 00000000 0000009e EXCHMEM!MpHeapAlloc+0x101
   0514f104 6facfa8b 0000009e 6facfb25 048b0588 EXCHMEM!ExchMHeapAlloc+0x13
   0514f10c 6facfb25 048b0588 00000000 0000009e MAPI32!LH_IntHeapAlloc+0xb
   0514f11c 6fa960bf 048b0588 00000000 0000009e MAPI32!LH_ExtHeapAlloc+0x15
   0514f138 6fa96118 00000001 048b0588 0514f16c MAPI32!MAPIAllocateBufferExt+0x2f
   0514f14c 00593ce1 00000096 0514f16c 00000001 MAPI32!MAPIAllocateBuffer+0x28
   0514f16c 00593ae3 063c7428 405904fc 00000000 EMSMTA!HrStrAToStrW+0x67
   00000001 00000000 00000000 00000000 00000000 EMSMTA!HrTrackWriteLogA+0x187


CAUSE
=====

This problem can occur because of a problem in the Mapi32.dll file.

RESOLUTION
==========

A supported fix is now available from Microsoft, but it is only intended to
correct the problem described in this article and should be applied only to
systems experiencing this specific problem. This fix may receive additional
testing at a later time, to further ensure product quality. Therefore, if you
are not severely affected by this problem, Microsoft recommends that you wait
for the next Microsoft Exchange Server version 5.5 service pack that contains
this fix.

To resolve this problem immediately, contact Microsoft Product Support Services
to obtain the fix. For a complete list of Microsoft Product Support Services
phone numbers and information about support costs, please go to the following
address on the World Wide Web:

   http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

NOTE: In special cases, charges that are normally incurred for support calls may
be canceled, if a Microsoft Support Professional determines that a specific
update will resolve your problem. Normal support costs will apply to additional
support questions and issues that do not qualify for the specific update in
question.

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

Component: MTA

+--------------------------+
| File name  | Version     | 
+--------------------------+
| Mapi32.dll | 5.5.2652.85 | 
+--------------------------+



WORKAROUND
==========

To work around this problem, disable message tracking on the affected servers,
both for the information store and the MTA. You can do so on a site level by
using the Exchange Server Administrator program, or on a for-each-server basis.
For additional information, click the article number below to view the article
in the Microsoft Knowledge Base:

   Q148963 XADM: Disabling Message Tracking For One or More Servers

STATUS
======

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

Additional query words: is crashes Mapi32 dll

======================================================================
Keywords          : exc55 kbExchange550preSP5fix kbExchange550sp4Fix 
Technology        : kbExchangeSearch kbExchange550 kbZNotKeyword2
Version           : :5.5
Issue type        : kbbug
Solution Type     : kbfix

=============================================================================

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