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Excel Services offers a number of Business Intelligence features such as:

• Workbooks can be connected to enterprise data sources
• The logic contained in workbooks can be reused in server based code, i.e. don’t have to rewrite code specifically for the server
• Provides real time analysis of data
• Full features UI experience, there is no loss of fidelity when moving to the server.
• Sorting, Filtering and drill down all work the same, no loss of functionality.

It’s worth your time investigating the features offered by Excel Calculation Services