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Microsoft KB Archive/175124

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Knowledge Base

Article ID: 175124

Article Last Modified on 10/28/2006


  • Microsoft Exchange Server 4.0 Standard Edition

This article was previously published under Q175124


When the server is started and Microsoft Exchange Server services are started or when the services are stopped and restarted you may receive the following error message:

The file mqrt.dll was not found.

The applications that trigger this message are as follows and occur in this order


and then an OleWinMainThread function.

Although this error message is generated, Exchange Server functionality is not impaired. All services start and function properly.


The problem occurs because Microsoft Message Queue Server (MSMQ) was installed and improperly uninstalled.

The errors occur because Microsoft Exchange Server checks for the following registry key


and the client related key


Both of these keys should have been removed using the uninstall process.


Remove these two keys and the error message should stop appearing.


The release version of MSMQ is included with Microsoft Windows NT Server Enterprise edition and is referred to as the Enterprise Edition. This is a tool for developing asynchronous, store-and-forward applications.

The Exchange Connector runs with Microsoft Exchange versions 4.0 or 5.0

The setup process includes setting up an Exchange mailbox of type MSMQ. The mailbox points to an MSMQ queue and forwards all the mail to the queue as messages. This process uses the MSMQ API set.

Microsoft Message Queue Server is a fast store-and-forward service for Microsoft Windows NT Server Enterprise Edition that requires Microsoft SQL Server version 6.5 to store the Message Queue Information Store (MQIS).

Additional query words: sql msmq (NTS/E)

Keywords: kbprb KB175124