You can cluster a Microsoft BizTalk Server 2006 Host and the Enterprise Single Sign-On (SSO) service only by using Microsoft Windows Clustering.
Microsoft supports using a Windows server cluster to cluster a BizTalk Host. Additionally, you can use a Windows server cluster to cluster the Enterprise SSO service that is integrated in BizTalk Server 2006 or in BizTalk Server 2004. BizTalk Host clustering is only available in BizTalk Server 2006 Enterprise Edition. In the other editions of BizTalk Server 2006 and in all the editions of BizTalk Server 2004, you cannot cluster a BizTalk Host.
Configurations in which you cluster a BizTalk Host by using any other clustering software or by using any other platform are not supported.
Additionally, configurations in which you cluster the Enterprise SSO service by using any other clustering software or by using any other platform are not supported.
For more information, visit the following Microsoft Web sites: