This article was previously published under Q271591
This article has been archived. It is offered "as is" and will no longer be updated.
When third-party antivirus programs that use the Exchange Antivirus API are running on a server with the Internet Mail Service, messages with large attachments or compression percentage are directed to the Internet Mail Service virtual Bad folder. This behavior most frequently occurs when multiple Internet Mail Service servers exist within the same Exchange Server site.
The ecVirusScanInProgress return code is being checked only once. If Exchange Server gets the return code again when the information store retries to open the same attachment, the return code is mapped to Mapi_call_failed, which causes the Internet Mail Service to move the mail to the Bad folder.
To resolve this problem, obtain the latest service pack for Exchange Server 5.5. For additional information, click the following article number to view the article in theMicrosoft Knowledge Base:
191914 XGEN: How to Obtain the Latest Exchange Server 5.5 Service Pack
The following files are available for download from the MicrosoftDownload Center:
For additional information about how to download Microsoft Support files, click the following article number to view the article in the Microsoft Knowledge Base:
119591 How to Obtain Microsoft Support Files from Online Services
Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help to prevent any unauthorized changes to the file.
Microsoft has confirmed that this is a problem in Microsoft Exchange Server, 5.5 Service Pack 3 (SP3). This problem was first corrected in Exchange Server 5.5 Service Pack 4.