F-SECURE ANTI-VIRUS FOR MICROSOFT EXCHANGE 7.10 Administrator's Manual page 32

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In environments with heavy e-mail traffic it is recommended to
use a Microsoft SQL server installed on a separate server. When
using the free Microsoft SQL Server 2005 Express Edition
included in F-Secure Anti-Virus for Microsoft Exchange, the
Quarantine database size is limited to 4 GB.
You can use F-Secure Anti-Virus for Microsoft Exchange Web
Console to manage and search quarantined content. For more
information, see "Quarantine Management", 237.