A shifting landscape for e-mail security

"Cisco Systems' purchase of e-mail security specialist IronPort Systems is another sign that big-name vendors are taking over the spam fight, analysts say.
Upon completion of the $830 million cash and stock deal, networking giant Cisco will join Symantec and Microsoft as a leader in the e-mail security arena. Those other companies entered the market via acquisitions and product development of their own. "
A shifting landscape for e-mail security CNET News.com