HA and Windows Server 2008 R2 Standard

Hi,

Four questions on Service Bus 1.0:

1. We have 3 Windows Server 2008 R2 Standard servers. When you read this article about HA you can read "The high availability feature of Windows Server AppFabric caching features requires all nodes in the cache cluster to be running the Enterprise Edition (or higher) of Windows Server 2008 or Windows Server 2008 R2". But when you look at the requirements of AppFabrikhere, it doesnt say anything about Enterprise Edition. Will it work with Standard edition?
2. If we can't run HA with Windows Server 2008 Standard, then how can we use Service Bus 1 on our 3 servers?
3. Is it a requirement to use HA for Service Bus 1?
4. Our three servers are load balanced and we want to use one Bus to serve them all. Isnt that possible without HA?

TR