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My team is beginning to use Windows Workflow Foundation, and are early in the process. We have been trying to research what changes we make will break workflows that are currently in process.
Anyone with experience that can answer (or point me in the direction of good documentation) this would be most appreciated.
You should consider all changes to a workflow definition a breaking change that will prevent existing instances from reloading. There are a few minor exceptions but for all intents and purposes you can ignore those.
With WF4.5 we get the ability to add version information to workflow instances and create update maps to convert state from one version to another. See my blog post here for some more details that where made public.