GFI Software commissioned the independent report that surveyed 200 IT decision makers.
Thirty six percent of the respondents said they have been affected up to three times in a year, meaning expense if PCs and servers need to be cleaned or re-installed after malware has been opened and executed by people.
Some respondents – 15 percent – said tthey had major spam related IT failures over 10 times in the last year.
The most common types of spam is phishing – 49 percent of respondents said it was the most prevalent type of spam.
Banking spam from real companies is the second biggest problem at 44 percent.
Third was dating site spam. 34 percent of respondents said it was their main worry.
And 56 percent surveyed said they’d notice a rise in spam levels over the past year.
Sergio Galindo, general manager at GFI software said crooks are using spam more and more to throw malware into the workplace for malicious reasons, to hold companies to ransom or to steal information that can be used for fraud.