1. Microsoft BackOffice Applications
Most BackOffice applications can take advantage of the Cluster service features.

2. You can install some products of the Microsoft BackOffice suite into a cluster. Other BackOffice applications can still run on each node of the cluster and perform work outside of the cluster, but they will not have failover capability. Microsoft Exchange and Microsoft SQL Server™ Enterprise Edition, are the BackOffice applications that are most commonly installed in a server cluster. They each have different Cluster service installation procedures.

3. Depending on which version of SQL Server or Exchange you are installing on the cluster, you will follow different installation procedures:
SQL Server creates a virtual server, installs all of the necessary files on both nodes, and creates all of the necessary cluster resources running SQL Server.
Exchange 2000 creates additional cluster resources that need to be manually added if you are going to configure them to be configured to run on a virtual server.
Other Microsoft BackOffice Applications that you can install on the server cluster are Microsoft Internet Information Services (IIS) and Microsoft Message Queuing.