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Error message when you delete a user in the source collection and then try to perform an incremental deployment in Microsoft SharePoint Server 2010: "Your changes conflict with those made concurrently by another user"
Article ID: 980517 - View products that this article applies to.
Consider the following scenario:
Your changes conflict with those made concurrently by another user.
When this issue occurs, the user is deleted in the target source collection. Therefore, you can safely ignore this error message.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.