Over one-fifth of home and office PC users using e-mail have knowingly opened an unknown e-mail attachment out of sheer curiosity, exposing themselves and others to e-mail borne viruses, according to a survey conducted by Central Command, an Ohio-based anti-virus software provider.

The survey was based on responses from around 90,000 PC users worldwide and explored individuals' computer security settings and behaviours with known computer security risks.

The results show that 31% of respondents using Instant Messaging (IM) software have accepted and downloaded a file transfer within the last six months, with 16% of those users claiming the file transfer came from an unknown source.

Of the 72% of users who use e-mail at work, 38% stated that they use an alternate web-based e-mail account for personal reasons at work which could open a security hole for the employer. In addition, 14% of the respondents said they open all attachments they receive at work regardless of the sender.

The majority of the surveyed PC users expressed no interest in changing their on-line activity or security practices after knowing the danger of recent threats, such as CodeRed, Sircam, Magistr, Hybris, and Loveletter.

41% of respondents claimed to have anti-virus software installed. Of those, only 26% update their anti-virus software for the newest virus threats at least monthly.

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