Unspecified vulnerability in the Windows Client API in Novell GroupWise 5.x through 7 might allow users to obtain "random programmatic access" to other email within the same post office.
https://exchange.xforce.ibmcloud.com/vulnerabilities/27550
http://www.vupen.com/english/advisories/2006/2594
http://www.securityfocus.com/bid/18716
http://www.securityfocus.com/archive/1/438725/100/0/threaded
http://support.novell.com/cgi-bin/search/searchtid.cgi?2974027.htm
http://support.novell.com/cgi-bin/search/searchtid.cgi?/2974006.htm
http://support.novell.com/cgi-bin/search/searchtid.cgi?/2973921.htm