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"Related to above, I've not been able to find documentation on the following question: Can the Team Foundation SharePoint installation coexist with another SharePoint installation ON THE DATA TIER? We'll have different application servers for the two, but we'd like to be able to utilze the same database instance. If not, we can create another SQL instance on the same server, but we'd lose the benefits of having it hosted on SQL Server Enterprise instead of SQL Server Standard."
This is an interesting question - however, it is not a scenario we have tested or support, so there is no documentation on this.