BBC NEWS | Technology | More than 95% of e-mail is 'junk'

Here's another great reason to explore workspaces (as complements to email and other types of communication channels) for collaboration: 

Analysis of the contents of millions of e-mails has revealed that less than 4% is legitimate traffic.

Further work has shown that most of this junk mail is originating on hijacked home computers.

Source: BBC NEWS | Technology | More than 95% of e-mail is 'junk'