Long Island-based Computer Associates has acquired California-based Qurb, an email software security provider, in an all-cash deal. According to Crain's New York, the deal will beef up the company's security management portfolio. Security management -- protecting against phishing and other forms of email fraud, for example -- is a market segment with room for growth, as anyone with a PC and an email account can testify. Just last month, Computer Associates also acquired Tiny Software, a provider of desktop firewall technology.