12. HP-LeftHand Networks: $360 million

HP said in November it would buy to fill in its storage virtualization and iSCSI lines with products for midsize companies and remote offices and branches. The Boulder, Colo., was an early developer of SANs built around iSCSI. It sells software that runs on existing storage and industry-standard server platforms

13. Sophos-Utimaco: $314 million

With the acquisition, antivirus expert Sophos gets a sizeable foothold in the endpoint data protection market, where it will compete with McAfee and CheckPoint Software. Utimaco is dominant in Germany and Western Europe, selling mainly to the type of large-enterprise customers that Sophos covets, said Sophos CEO . Last year, Sophos bought its way into the network access control market via its .

14. Ciena-World Wide Packets: $290 million