The question's about Sharepoint 2010.
Let's consider a following scenario: there are instances of a workflow X in progress at the server (for example, waiting for user's interaction). Then, deployment of a newer version of the same workflow takes place, overwriting the existing one.
May it happen that the deployment of newer version interfere with already running instances of OLDER version of workflow X?
- Will the old instances behave as they were defined?
- Or will they behave as it was defined in the newer version of workflow X (if for example user added or deleted some actions)
- Or will they stop / crash etc.?