Companies that have employees running Office for Mac 2011 have just over 100 days to replace the suite's applications with those from last year's upgrade, Office for Mac 2016.

Support ends for Office for Mac 2011 on Oct. 10, a date that Microsoft first stamped on the calendar two years ago, but has not widely publicized since. As of that date, the Redmond, Wash. developer will cease supplying patches for security vulnerabilities or fixes for other bugs.

The individual applications -- Excel, PowerPoint, Outlook and Word -- will continue to operate after support ends, but companies will be taking a risk, however small, that malware exploiting an unpatched flaw will surface and compromise systems.

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