Is that only possible in 10.1?
Just use the overwrite feature service when you need to publish updated layers.
There is no way to update the features from a shapefile. Once a shapefile is loaded into a map, those features are stored in the map.Soon, we'll be releasing subscriptions for ArcGIS Online that will allow you to create services out of your data. You can update your data directly in the service and any web map that references the service will immediately reflect changes made to the data. Thus, all of your symbolization and popup configuration will be retained. This will be the recommended workflow moving forward.Thanks,Mike
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