My application will use Microsoft.Exchange.Data.Mime / Microsoft.Exchange.Data.ContentTypes namespaces which are in Microsoft.Exchange.Data.Common.DLL When I'll distribute my app, I'll must setup this runtime on the client machine (without E2007) Is there a redistribuable (.msm or a set of dll) for Exchange 2007 ? Can I simply copy Microsoft.Exchange.Data.Common.DLL on the client machine ? Another solution ? This runtime works on W2003 ? (with SP 1 & .NET V2 ?) (I suppose the .NET 2 must be installed) Thanks,