On October 10, 2017, mainstream support will end on Office for Mac 2011. Upgrades are recommended prior to the support end date. Find details on technical requirements here
Office 2016 for Mac applications as part of Office 365 ProPlus
Office 2016 for Mac
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Re: End of mainstream support on Office for Mac 2011
You forgot to mention this includes removing 2011 from the activation servers. Fraudulant Mac for home and business is a product still being sold on the market. Why would MS prevent activation of product keys if it is still being sold on the open market?