Event ID 2091 is logged when a public folder is replicated between Exchange Server 2003 servers

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In an Exchange 2003 environment, public folder replications occur between Exchange servers. Several posted messages may be contained within the same replication message and may be sent from source server to the target server. In certain scenarios, this replication message is dropped on the target server, and none of the posted messages is replicated successfully. When this problem occurs, the following event is logged on the target server:

Event Type: Warning
Event Source: MSExchangeIS Public Store
Event Category: Transport Delivering
Event ID: 2091
Description: A message deliver to public folder store "<Storage Group>\<Public Folder Store>" with message class IPM.POST is being dropped.

This problem occurs if one of the posted messages of the same replication message includes uncompressed Rich Text Format (RTF) body in the PR_RTF_COMPRESSED property. When Exchange Server processes the replication message, it detects the incorrect data in the PR_RTF_COMPRESSED property in the posted message. Then, the Exchange server discards the whole replication message.

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.


This hotfix requires Microsoft Exchange Server 2003 Service Pack 2 to be installed on the server because of file dependencies. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
836993 How to obtain the latest service packs for Exchange Server 2003

Restart requirement

You do not have to restart the computer after you apply this hotfix. However, the following services are restarted automatically when you apply this hotfix:
  • The Microsoft Exchange System Attendant service
  • The Microsoft Search service
  • The Internet Information Services (IIS) Admin Service and all dependent services

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 file attributes) 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 item in Control Panel.
File nameFile versionFile sizeDateTime
More information
For more information about the PR_RTF_COMPRESSED property, visit the following Web site:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

Article ID: 960993 - Last Review: 01/16/2015 02:52:11 - Revision: 2.0

  • Microsoft Exchange Server 2003 Standard Edition
  • Microsoft Exchange Server 2003 Enterprise Edition
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