Fix stale link in README.md (#9889)

Author: ofek

README.md

@@ -13,7 +13,7 @@ Orleans builds on the developer productivity of .NET and brings it to the world
 
 Orleans takes familiar concepts like objects, interfaces, async/await, and try/catch and extends them to multi-server environments. As such, it helps developers experienced with single-server applications transition to building resilient, scalable cloud services and other distributed applications. For this reason, Orleans has often been referred to as "Distributed .NET".
 
-It was created by [Microsoft Research](http://research.microsoft.com/projects/orleans/) and introduced the [Virtual Actor Model](http://research.microsoft.com/apps/pubs/default.aspx?id=210931) as a novel approach to building a new generation of distributed systems for the Cloud era. The core contribution of Orleans is its programming model which tames the complexity inherent to highly-parallel distributed systems without restricting capabilities or imposing onerous constraints on the developer.
+It was created by [Microsoft Research](http://research.microsoft.com/projects/orleans/) and introduced the [Virtual Actor Model](https://www.microsoft.com/en-us/research/publication/orleans-distributed-virtual-actors-for-programmability-and-scalability/) as a novel approach to building a new generation of distributed systems for the Cloud era. The core contribution of Orleans is its programming model which tames the complexity inherent to highly-parallel distributed systems without restricting capabilities or imposing onerous constraints on the developer.
 
 ## Grains