Dell is acquiring network-security and data-protection tool provider SonicWall for an estimated $1 billion to $1.5 billion. This is the latest in a series of acquisitions Dell has made in recent months. It has acquired Force 10, Perot Systems and SecureWorks. All of these companies focus on different areas: Perot Systems is a consultant; SecureWorks offers managed security services. The addition of SonicWall rounds out Dell's portfolio.
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