Microsoft is warning customers that it will retire several Office application viewers in little more than four months, shutting off the spigot to the free document readers used by those without the productivity suite.

"The Excel Viewer, PowerPoint Viewer, PowerPoint 2007 Viewer and the Office Compatibility Pack, will be retired in April 2018," said a post to a company blog. "At that time, they will no longer be available for download and will no longer receive security updates."

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