Microsoft Exchange 2010 security & product support have been extended until October 2020, allowing additional time for corporate users to migrate to newer versions

https://www.zdnet.com/article/microsoft-pushes-back-end-of-support-for-exchange-server-2010-by-nine-months/

Microsoft is pushing back its announced end of support date for Exchange Server 2010. Instead of cutting off security updates for the product on January 14, 2020, Microsoft is now planning to drop free support for the product on October 13, 2020.  Microsoft officials announced the push back on September 16. They said they adjusted “after investigating and analyzing the deployment state of an extensive number of Exchange customers.”