Hi XinYong,
As I mentioned before, it depends on whether your users use other SAS client applications and save content in their My Folder area. It also depends on how you plan to hide it, deleting it is not advised. You might find the following references to help with your impact question:
http://support.sas.com/documentation/cdl/en/bisag/68240/HTML/default/viewer.htm#p0m58rt1se8r58n1dd6pujtbiwl3.htm
http://support.sas.com/documentation/cdl/en/bisag/68240/HTML/default/viewer.htm#p0sc8uk5ttcvhzn1gfcjhkacwpcu.htm
Kind Regards,
Michelle
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