The assigning of a block till date allows you to work with the block date as blocking may vary on the
incidents and the number of incidents and the number of each type of incidents you will tolerate.
Not assigning a value will use the rules on the endpoints, overwriting the value will cause a hard-block
Requirements
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2