A grease composition containing a lubricant base oil, diurea compounds represented by the following general formulas to, and an organic molybdenum compound; wherein respective contents of the diurea compounds represented by the following general formulas to satisfy conditions defined by the following expressions and ; and wherein the organic molybdenum compound is contained by 0. The actuator unit is operated in at least one of the drive directions only if a corresponding polarity control signal is present and the control input is additionally supplied with a predefined control signal. Because the managed folder is part of the network-accessible file system, any permissions, authorizations, or settings for files may be unaltered after movement into the managed folder.