I found an interesting issue in BizTalk Server the other day. If you try to setup two file receive locations looking at the same filesystem location the admin tool and BizTalkOM will stop you. However, both will happily let you add a receive location for a unc path pointing to that filesystem location and another receive location using the local path of the filesytem location. e.g. C:\abcTest or \\ServerName\C$\abcTest. Just something to be aware of.