Nearly 340 million people who run Microsoft’s Internet Explorer have just a week to upgrade or switch browsers, or face a shutoff of the security patch spigot.

On Jan. 12, Microsoft will serve up the final security updates for all instances of Internet Explorer 7 (IE7) and IE8 and for most of the copies of IE9 and IE10 now on customers’ PCs.

That’s the deadline Microsoft set a year and a half ago, when it unexpectedly announced that most users would have to be running IE11 by that date. After Jan. 12, Microsoft will support IE9 only on the rarely used Windows Vista and Windows Server 2008, and IE10 only on Windows Server 2012. Everyone else must be running IE11 or Edge to continue to receive security updates and technical support.

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