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In general, if the project is compiling and running cleanly, then it has already been migrated. Migration doesn't do anything magical. It just goes into the .project, .classpath, and .settings folders and replaces all the com.springsource.* with appropriate org.springframework.* or org.grails.*.
I'm not sure if there's anything necessary for vanilla spring projects, but I would say that if the project is running, then it does not need to be migrated.