MSDN article on versioning in Windows Workflow Foundation

My current Foundations article on versioning in Windows Workflow Foundation (May 2009)  is now available online.  In this issue I tried to cover the core issues around versioning workflows to help developers understand the core issues that make it hard in the first place.  I then attempt to provide some guidance and tips on how you can ease some of the pain and work around some of the issues.  I didn’t have space to give this topic the complete coverage it deserved, but hopefully this article helps people gain a deeper understanding of the issues and how to approach versioning in workflows and workflow services.