Topic Last Modified: 2006-07-13

The Microsoft® Exchange Server Analyzer Tool examines the Exchange Function Call Log (FCL), Store.fcl file for events that indicate ongoing cross-component calls from the Microsoft Exchange Information Store service (Store.exe) to the Virusscan Virus API (VAPI) component.

Ongoing calls are requests from the Microsoft Exchange Information Store service (Store.exe) to other components that have not received a response at the time the Exchange FCL data is written to the Store.fcl file.

If the Exchange Server Analyzer finds events in the Store.fcl logging file that reflect ongoing calls from the Microsoft Exchange Information Store service (Store.exe) to the VAPI component, the Exchange Server Analyzer displays a warning.

This warning indicates that performance may become an issue for this server. Occasional ongoing calls do not necessarily indicate a problem, but repeated ongoing calls to the same area might.

When cross-component calls from the Microsoft Exchange Information Store service (Store.exe) wait for a response, remote procedure call (RPC) threads can back up behind these requests and lead to Exchange Server performance issues such as delays in server responses to clients.

Ongoing calls from the Exchange Information Store service to the VAPI component can be caused by the following conditions:

To address this warning, take the following steps:

For More Information

For more information about virus-scanning programs that are typically used with Microsoft Exchange Server 2003, see the Microsoft Knowledge Base article 823166, "Overview of Exchange Server 2003 and antivirus software" (http://go.microsoft.com/fwlink/?LinkId=3052&kbid=823166).

For more information about virus-scanning programs that are typically used with Microsoft Exchange 2000 Server, see the Knowledge Base article 328841, "Exchange and Antivirus Software" (http://go.microsoft.com/fwlink/?LinkId=3052&kbid=328841).

For more information about Exchange Server performance, see the "Performance and Scalability Guide for Exchange Server 2003" (http://go.microsoft.com/fwlink/?LinkId=47576).

For more information about how to troubleshoot Exchange Server performance issues, see "Troubleshooting Microsoft Exchange Server Performance" (http://go.microsoft.com/fwlink/?LinkId=47588).

For more information about how to troubleshoot information store performance, see Microsoft Knowledge Base article 257725, "XADM: How to Collect Diagnostic Data for Information Store Troubleshooting" (http://go.microsoft.com/fwlink/?LinkId=3052&kbid=257725).