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All settings stored in NbPreferences are imported by definition (see http://netbeans.czech/wiki/view/Netbeans/NB61SettingsMigration). Autoupdate has to find own way how to differentiate Update Center from previous version and current version and exclude old ones. To consider: import only user-defined Update Centers
fixed http://hg.netbeans.org/core-main/rev/4439d271b1d2