Cisco has agreed to buy privately-owned IronPort Systems, which provides messaging security appliances, focusing on enterprise spam and spyware protection.
"We feel there is enormous potential for enhanced E-mail and message protection solutions to be integrated into the existing Cisco Self-Defending Network framework," says Richard Palmer, senior vice-president of Cisco's Security Technology Group.
"Using the network as a flexible platform to integrate IronPort's technologies, Cisco will be able to build new security applications as customers' demands evolve."
Scott Weiss, CEO of IronPort Systems, adds: "Internet messaging threats continue to get more sophisticated, and IronPort has repeatedly delivered industry-leading solutions.
"Integrating IronPort's messaging security technology with Cisco's Self-Defending Network will enable a new level of defense for our customers."
Under the terms of the agreement, Cisco will pay about $830-million in cash and stock.
The acquisition is subject to various standard closing conditions and is expected to close in the third quarter of Cisco's fiscal year 2007.
IronPort was founded in 2000 and has 408 employees.
Once the transaction is finalised, the IronPort team and product portfolio will operate as a business unit in Cisco's Security Technology Group.