Collaborative Data Objects heap corruption occurs when you try to access an Exchange mailbox (823343)


The information in this article applies to:

  • Microsoft Exchange Server 2003 Standard Edition
  • Microsoft Exchange Server 2003 Enterprise Edition
  • Microsoft Office Outlook 2003
For a Microsoft Exchange 2000 Server version of this article, see 824960.

For a Microsoft Exchange Server 5.5 version of this article, see 818709.

SYMPTOMS

When you use a third-party program that uses Collaborative Data Objects (CDO) 1.21 to access a mailbox on a computer that is running Microsoft Exchange Server 2003, the third-party program may stop responding.

CAUSE

This problem occurs when you try to access a user account that was previously accessed by a client computer that is running Microsoft Office Outlook 2003.

Outlook 2003 adds a fourth entry to PR_FREEBUSY_ENTRYIDS, a MAPI property with multiple values that is stored on the Inbox folder. Collaborative Data Objects (CDO) 1.21 only expects three entries. This causes heap corruption that causes the third-party program to stop responding.

RESOLUTION

Hotfix Information

A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Exchange Server 2003 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/default.aspx?scid=fh;[LN];CNTACTMS

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

You can also download this hotfix from the Microsoft Download Center. To do so, visit the following Microsoft Web site:

http://www.microsoft.com/downloads/details.aspx?FamilyId=CA4DFFB9-4937-4DE4-B66F-9990F75C908E&displaylang=en

Prerequisites

There are no prerequisites.

Restart Requirement

You do not have to restart your computer after you apply this hotfix.

Hotfix Replacement Information

This hotfix does not replace any other hotfixes.

File Information

The English version of this hotfix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel. 

Date         Time   Version         Size     File name
------------------------------------------------------------
03-Jun-2003  19:12  6.5.6980.3      708,096  Cdo.dll

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Modification Type:MinorLast Reviewed:10/3/2005
Keywords:kbHotfixServer kbQFE kbinterop kbQFE kbfix kbBug KB823343 kbAudITPRO
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