Adobe provides five years of product support from the general availability date of Adobe Acrobat and Adobe Reader. In line with that policy, support for Adobe Acrobat X and Adobe Reader X will end on November 15, 2015.
End of Support means that Adobe will no longer provide technical support or distribute runtimes, including product and/or security updates, for all derivatives of a product or product version (e.g. localized versions, minor upgrades, operating systems, dot and double-dot releases, and connector products).
While you may continue to use Acrobat and Reader X, Adobe will no longer provide any updates or address any existing bugs or security issues in the software. Technical support for this version of Acrobat will also be discontinued.
For the most reliable and secure experience using Adobe Acrobat software, Adobe recommends upgrading to the latest versions of Adobe Acrobat DC and Adobe Acrobat Reader DC. This will ensure that you benefit from all new functional enhancements and security updates, not to mention support for newer operating systems.