F-SECURE ANTI-VIRUS FOR MICROSOFT EXCHANGE 8.00 Administrator's Manual page 41

Which SQL Server to Use for the Quarantine Database?
Microsoft SQL Server
2005 Express Edition
As a minimum requirement, the Quarantine database should have the
capacity to store information about all inbound and outbound mail to and
from your organization that would normally be sent during 2-3 days.
The upgrade installation does not upgrade the SQL server if you
choose to use the existing database.
If you want to upgrade MSDE 2000 to SQL Server 2005 Express,
follow the instructions on the Microsoft web page:
http://www.microsoft.com/technet/prodtechnol/sql/2005/
msde2sqlexpress.mspx.
Take the following SQL server specific considerations into account when
deciding which SQL server to use:
When using Microsoft SQL Server 2005/2008 Express Edition,
the Quarantine database size is limited to 4 GB.
Microsoft SQL Server 2005/2008 Express Edition supports
Microsoft Windows Server 2008.
It is not recommended to use Microsoft SQL Server 2005
Express Edition if you are planning to use centralized quarantine
management with multiple F-Secure Anti-Virus for Microsoft
Exchange installations.
Microsoft SQL Server 2005 Express Edition is delivered
together with F-Secure Anti-Virus for Microsoft Exchange, and
you can install it during the F-Secure Anti-Virus for Microsoft
Exchange Setup.
CHAPTER 3 41
Installation