Support for Adobe Reader 8 and Adobe Acrobat 8 has ended. As a policy, Adobe provides five years of product support, starting from the general availability date of Adobe Reader and Adobe Acrobat. In line with this policy, support for Adobe Reader 8.x and Adobe Acrobat 8.x will end on November 3 2011.
End of Support means that Adobe no longer provides technical support or distributes runtimes. This policy affects product and security updates for all derivatives of a product or product version (localized versions, minor upgrades, operating systems, dot and double-dot releases, and connector products.)
You can read the whole technote here or I can save you the trouble and summarize. Upgrade… as quickly as possible.
There are three key, IT related, reasons to upgrade to Acrobat X or Reader X; end-of-support is just the first. The other two are the Protected View/Mode or “Sandboxing” and support for SCCM deployment and SCUP maintenance. You can read more about these technologies at the related articles below.
You’ll also find that version 10 loads faster, displays a progress bar when downloading PDF files in the browser and generally has a much cleaner appearance especially in the browser. If you’ve been using Acrobat or Reader 8, you’re going to love Acrobat and Reader X.