Here's some notable tech M&A activity happened till May, 2010.
In Security space,
- Oracle IdM adding identity analytics (OIA) to it's portfolio through the broader Sun acquisition
- Symantec enhancing encryption portfolio with PGP, GuardianEdge, and vulnerability assessment offering through Gideon Technologies
- EMC's RSA Security Division acquired Archer Technologies for GRC across physical+virtual infrastructures
- Trustwave acquired Intellitactics for SIEM to enhance PCI compliance offering, and BitArmor to enhance endpoint security offering
- VmWare seems to be building up Cloud PaaS platform acquiring Spring Source (in 2009) , and now Zimbra, and Rabbit Technologies
- CA acquired Nimsoft and 3Tera to manage cloud environments
- Cisco acquired Rohati Systems for cloud security in Cisco's Nexus switch line
- SAP planning to buy Sybase for it's mobile middleware
- Apple getting Siri, HP getting Palm, RIM getting Viigo
Network World slideshow on Tech acquisitions of 2010
PWC report on Tech M&A insights for 2010