"Multi-Targeting Pack for Microsoft .NET Framework 4 Platform Update 1" (with an official State Machine support for WF4)
"Lots of people like to use the state machine model workflow as this is a very flexible way of working that often fits in with how real work processes work. With WF3 we had a state machine workflow but with WF4 this was not ready in time and as a result we didn’t get to use this model. There where a few whitepapers on how to do a state machine using a flowchart and for simple cases those worked quite well.
Microsoft also released an implementation of the state machine for WF4 on CodePlex and while that worked quite well it was a not supported scenario ...
Now I always suspected we would have to wait for the next full version of the .NET framework it turns out we will get the real bits much sooner. The soon to be released Multi-Targeting Pack for Microsoft .NET Framework 4 Platform Update 1, now that is a mouth full, will contain the officially supported version of the state machine. See here for a how to guide on how to use the state machine. ..."
I think the "Multi-Targeting Pack for Microsoft .NET Framework 4 Platform Update 1" release is new to me (at least as I sit here I don't remember hearing about this release)... Good to see Microsoft listening and responding by returning official State Machine support to WF4.