Daniel Morgan: Microsoft deprecates System.Data.OracleClient in .NET 4.0
Daniel makes a good point here… Microsoft has usually done a great job when interoperability is the goal. .NET including the Oracle provider before Oracle really supported it was a big plus for developers and those using oracle databases.
Looking at the comments, losta of developers are not happy about it either. Well we will see where this ends up, but keep it in mind if you are trying to use Oracle, migrating to ODP.NET might be your only option.
http://blogs.msdn.com/adonet/archive/2009/06/15/system-data-oracleclient-update.aspx
Daniel Morgan: Microsoft deprecates System.Data.OracleClient in .NET 4.0