Installing Confluence on Yahoo Small Business Server is not going to work as Confluence is a Java-based web application and Yahoo Small Business Server does not provide Java as an available language.
If you're interested in a hosted version of Confluence rather than running your own servers your best bet is Atlassian OnDemand. Alternatively you could use managed hosting such as Contegix or a Virtual Private Server provider such as RackSpace Cloud.
Hope that helps?
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