ADO.NET using ExDAV.ExSearcher
Connection string
This ExDAV connection string can be used for connections to Exchange.
ExDAV.ExSearcher searcher = new ExDav.ExSearcher("http://mystore.edu/myresource");
searcher.Depth = ExDAV.ExRequest.ExRequestDepths.AllChildrenWithRoot;
searcher.ExProps.Add("DAV:", "creationdate");
ExDAV.ExResponse resp = searcher.Search("WHERE \"DAV:isfolder\" = true");
System.Data.DataSet ds = resp.GetDataSet("dsMyExDataSet", "dsMyExTableName");
Check out this article for details on how to access Exchange data from .NET.