Microsoft has issued four "critical" security updates for its Internet Explorer browser and the Exchange Server e-mail platform.
The critical updates, part of Redmond's monthly security update, are designed to stop hackers remotely taking control of users' systems.
Microsoft Security Bulletin MS09-002 plugs two holes in Internet Explorer, and Security Bulletin MS09-003 fixes the two threats to Exchange Server.
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In addition, Security Bulletin MS09-004 fixes an "important" remote code execution vulnerability in SQL Server.
Also, Security Bulletin MS09-005 tackles three important vulnerabilities in Microsoft Office.