Since we have a contract with Microsoft, we are mainly using their products. I think it's the only product that is available on the Windows server. It's better to use it rather than another clustering service.

Before Windows Failover Clustering, Digital Equipment VMS Clusters did the same job. The platform died (also because it was quite expensive), the developers changed to Microsoft and released a failover clustering solution along with Windows NT 4.0, which would run on X86 servers.