Page is a not externally linkable
-- Bing Search Engine News
---- Bing is finding hidden folders on server
phranque - 10:54 am on Sep 28, 2012 (gmt 0)Thread source:: http://www.webmasterworld.com/msn_microsoft_search/4500519.htm
i would not start with the assumption that bing uses malware or malice to discover unguessable urls.
Brought to you by WebmasterWorld: http://www.webmasterworld.com