Businesses that remain wedded to Office 2007 have just over three months to drop Office 2007's applications and switch to a newer suite, such as Office 2016.

Office 2007's support expires Oct. 10. After that date, Microsoft will no longer supply patches for security vulnerabilities or fixes for other bugs, nor will it provide company-assisted technical support, whether free or paid, such as by-phone consultations or trouble-shooting.

Initially, Office 2007 support was set to end in April -- at the same time Windows Vista was put to pasture -- but in 2012 Microsoft extended the productivity suite's support by six months. The reason for the extra time: a little-known provision in the company's support policy that guarantees at least two years of "mainstream" support after the launch of a product's successor (in this case, Office 2010).

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