Choose 'Configure SQL Server for application services' (the default choice) ... then ASP.NET Configuration and create more users/roles as we did with the first one.
You can use DsWriteAccountSpn (see http://msdn.microsoft.com/library/default.asp?url=/library/en-us/ad/ad/dswriteaccountspn.asp?frame=true) to register that SPN.
... role services must be installed before attempting to install this product: Static Content, Default Document, HTTP Errors, ASP.NET, .NET Extensibility, ...
To download the SDKs and tools, visit the Exchange downloads list page at: http://msdn.microsoft.com/library/default.asp?url=/downloads/list/exchange.asp.
By default, the maximum size for uploading files is set to 50 MB. ... to prevent timeouts on the page. The default timeout for ASP.NET 2.0 is 110 seconds, ...