Answer
Applies to:- GFI MailEssentials
GFI MailEssentials supports the installation on a Microsoft Windows Server 2003 active / passive cluster setup. Active / active setups are not supported. The following section within the GFI MailEssentials manual explains how to set up GFI MailEssentials on a Microsoft Windows Server 2003 active / passive cluster:
http://manuals.gfi.com/en/mailessentials/Default.htm?#Administrator/Installation/Preinstall_actions/Clusters.htm
NOTE
- These instructions only apply to GFI MailEssentials 2012 Service Release 3 (build 20121218) and later. The build number can be verified from the GFI MailEssentials configuration, General Settings > Version Information