This article describes which folders to exclude when you perform a file-level antivirus scan on a server operating system. You must exclude these folders if you use one of the following antivirus programs:

• Microsoft Forefront Protection 2010 for Exchange Server
• Microsoft Forefront Security for Office Communications Server
• Microsoft Forefront Security for Exchange Server
• Microsoft Forefront Security for SharePoint
• Microsoft Antigen 9.0 for Exchange
• Microsoft Antigen 9.0 for SMTP Gateways
• Sybari Antigen 8.0 for Microsoft Exchange
• Sybari Antigen 8.0 for SMTP Gateways
• Sybari Antigen 8.0 for Microsoft SharePoint Portal Server
• Sybari Antigen 8.0 for IM

Exclude the following folders before you perform a file-level antivirus scan on a server operating system:

• The installation folder of the antivirus software
  
  Notes
  • The following path is the default location of the installation folder for Forefront Protection 2010 for Exchange Server:
    Drive:\program files (x86)\Microsoft Forefront Protection for Exchange Server
    The Drive placeholder specifies the letter of the drive on which Windows is installed. By default, this is drive C.
  • The following path is the default location of the installation folder for Antigen Enterprise Manager:
    Drive:\Program Files\Microsoft Antigen Enterprise Manager
    The Drive placeholder specifies the letter of the drive on which Windows is installed. By default, this is drive C.
  • The following path is the default location of the installation folder for Forefront Security for Exchange Server:
    Drive:\Program Files\Microsoft Forefront Security\Exchange Server
    The Drive placeholder specifies the letter of the drive on which Windows is installed. By default, this is drive C.
  • The following path is the default location of the installation folder for Forefront Security for SharePoint:
    Drive:\Program Files\Microsoft Forefront Security\SharePoint
  • The following path is the default location of the installation folder for Antigen for Exchange:
    Drive:\Program Files\Microsoft Antigen for Exchange
  • The following path is the default location of the installation folder for Antigen for SMTP Gateways:
    Drive:\Program Files\Microsoft Antigen for SMTP
  • The following path is the default location of the installation folder for Antigen for Exchange:
    Drive:\Program Files\Sybari Software\Antigen for Exchange
  • The following path is the default location of the installation folder for Antigen for SMTP Gateways:
    Drive:\Program Files\Sybari Software\Antigen for SMTP
  • The following path is the default location of the installation folder for Antigen for SharePoint Portal Server:
    Drive:\Program Files\Sybari Software\Antigen for SharePoint
  • The following path is the default location of the installation folder for Antigen for IM:
    Drive:\Program Files\Sybari Software\Antigen for IM
• The Drive:\Program Files\Exchsrvr folder
  
  Note The file-level antivirus scan can cause a conflict when Antigen tries to scan e-mail messages.
• The following path is the default location of the installation folder for Forefront Security for Office Communications Server:
  <drive>:\Program Files\Microsoft Forefront Security\Office Communications Server
  In order to prevent corruption, you must also make sure that the folder in which you installed Microsoft Office Communications Server is not scanned. The following paths are the default locations of the installation folders for Microsoft Office Communications Server, depending on the version that you have installed:
  <drive>:\Program Files\Microsoft Office Communications Server 2007
  <drive>:\Program Files\Microsoft Office Communications Server 2007 R2
  Note The <drive> placeholder specifies the letter of the drive on which Windows is installed. By default, this is drive C.

The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

More information about Microsoft Forefront Security for Office Communications Server and third-party file-level antivirus scans

In addition to the problem in which a third-party file-level antivirus scans files before FSOCS does and causes a scanning conflict, other problems may occur if a third-party file-level antivirus scans the FSOCS folder or the OCS installation folder. These problems may include the following:

• Errors logged to the ProgramLog.txt file:
  "EXCEPTION: FSOCAgent.dll.Scanner.ScanData(""):0 - The system returned the following exception: " The system returned the following exception: Error HRESULT E_FAIL has been returned from a call to a COM component.
  
  
  "ERROR: FSOCAgent.dll.ScanManager.ScanAction("<FSOCAgent.Action action><FSOCAgent.DataList scanData>"):0 - An exception was thrown from FSOCScanner during scanning." The system returned the following exception: Exception of type 'Microsoft.FSO.Common.FsoCommonException' was thrown.
  
  
  "EXCEPTION: ForefrontRTCProxy64.exe.RtcProcessingWorkFlows.InterceptAndScanThread("<System.Object fsoTransactionObj>"):0 - An exception occurred while trying to intercept and scan a file transfer." The system returned the following exception: Exception of type 'Microsoft.FSO.Common.FsoCommonException' was thrown.
• Errors logged to the HRLog.txt file:
  "INFORMATION: S 0x80004005, 7082-(workthread::ScanFileOrMessage) (Unspecified error)"
  
  
  "INFORMATION: F 0x80004005, 7603-(workthread::OnScanFile) (Unspecified error)"

Additionally, viruses that are sent to users via OCS may be detected by the third party file-level antivirus software, not by FSOCS.