Don't want to be too conspiratorial about this article but why would a business write it?

No one can disagree with its sentiments.

However three things:

- while the advice is useful serious hackers and dataminers can extract details (bank account details, passwords) through non text/non message data on emails. This is involuntary disclosure.

- Involuntary disclosure is where a computer companies services really come in. They are businesses with software and hardware security solutions to sell - usually in combination with business partners: http://www.unisys.com/about__unisys/partners/security.htm

- one class of security products has been used by many businesses for years to monitor their employees. This has become a political debate due to legislation being considered. If a business is a high security defence contractor then monitoring emails going each way and stopping spyware coming in might be justified. However if too many businesses are expected to monitor emails than this is security overkill.

Anyway the article has good advice especially about kids.

Pete
http://spyingbadthings.blogspot.com/