F-SECURE ANTI-VIRUS FOR MICROSOFT EXCHANGE 8.00 Administrator's Manual page 311

Type FSAVMSEQS$ as Share name and make sure that User limit is
set to Maximum Allowed.
Click Permissions
5. Permissions dialog opens.
Add Administrator, Exchange Domain Servers and SYSTEM to the
Group or user names. Remove Everyone account. Grant Change and
Read permissions for Exchange Domain Servers and SYSTEM, and
Full Control, Change and Read permissions for Administrator
account. Click OK.
6. In the directory properties dialog, go to the Security tab.
APPENDIX C
Deploying the Product on a Cluster
311