Email security provider Proofpoint has acquired an on-demand email archiving vendor to boost its offerings.

A global software firm that specializes in collaborative business solutions announced Friday it is acquiring messaging security provider Tumbleweed Communications.

The Information Technology Association of America has absorbed the Cyber Security Industry Alliance, a lobby that has been pressuring lawmakers to pass federal data security and breach notification measures.

Symantec announced this week plans to buy AppStream, provider of on-demand application delivery.

Hitachi has acquired M-Tech Systems, Inc. as part of a strategy to broaden its overall security portfolio.

Microsoft has shored up its enterprise security portfolio -- and gained a toehold in the government marketplace -- with the acquisition of Komoku, a government-funded startup with products that snoop out rootkits.

In an attempt to boost its online privacy stance, Microsoft has announced that it has acquired the U-Prove identity management technology from Credentica.

A dismal earnings forecast this week from intrusion prevention maker Sourcefire underscores some of the challenges facing public IT security companies, a pair of analysts said Friday.

ChoicePoint, whose watershed breach prompted a burst of state disclosure laws, has been acquired by LexisNexis information service parent, Reed Elsevier, for $4.1 billion, the two companies announced Thursday.

U.K.-based encryption and key management provider nCipher announced today it acquired most of the intellectual property and assets of NeoScale Systems, an appliance-based enterprise storage security firm that recently ceased operations.