from the maven-user mailing list: Jason van Zyl says ... Just a note so that folks know what's coming. The maven-eclipse-plugin will not work with M2Eclipse anymore. If M2Eclipse sees projects generated with the maven-eclipse-plugin it won't import them. M2Eclipse works by creating the necessary projects files by inspecting the POM and doesn't expect the Eclipse project files to have been created by an external third party.
If you use the maven-eclipse-plugin your projects will *not* be supported in M2Eclipse. You will need to pick one mode, either use the maven-eclipse-plugin and stock Eclipse or import your projects using M2Eclipse. I'm starting to try to use M2Eclipse - it seems very good... -Marshall
