67% of large companies with 5,000 or more employees reported one successful intrusion or more this year. Mid-size companies of 1,000 to 4,999 employees fared better with 59% reporting an intrusion, up slightly from 57% in 2009. Fourteen percent of those surveyed attributed their intrusion problem to “hacker/network attack,” 12% cited “lack of adequate security policies/measures,” 10% said “employee Web usage,” 9% pointed to “virus/malware/spyware””]