F-SECURE ANTI-VIRUS FOR MICROSOFT EXCHANGE Administrator's Manual page 211

Local Protection with F-Secure Anti-Virus for Windows Servers
Q. Can all files on a Microsoft Exchange computer be scanned for
viruses, or are some files and folders excluded from scanning
automatically?
A. The working and quarantine directories of F-Secure Anti-Virus for
Microsoft Exchange are added to the OAS excluded list during the
installation.
Microsoft Knowledgebase article #245822 'Recommendations for
troubleshooting an Exchange computer with antivirus software
installed' describes what files and folders should never be scanned
with file-based antivirus software:
default.aspx?scid=kb;en-us;245822.
Quarantined and Disinfected Files
Q. When examining a raw message that has been disinfected, there
seems to be some data that should be stripped. Is the message
still infected?
A. Disinfected messages do not contain any malicious code. The
Microsoft Exchange server keeps the original message header in the
message, so MIME-part headers may appear in the raw message
data.
http://support.microsoft.com/
CHAPTER C 211
Troubleshooting