Microsoft’s plan to “sandbox” Office documents in the next version of its application suite is an admission that it can’t keep hackers from exploiting file format bugs, a security analyst said today.

Microsoft plans to add a feature to Office Excel that will make it harder for cyberattackers to exploit the spreadsheet application's "add-ins" function to run malicious code on a victim's computer.

Microsoft on Tuesday beefed up security in Office 2003 and Office 2007 on Windows by adding a feature that first appeared in the newer Office 2010 last year. In Office 2010, the security feature — ...

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