Many may question the relevance of needing Adobe Reader but there are several use cases that the open source versions of reading tools simply do not provide. More on it too here: Adobe abandons Linux. If you need native Adobe Reader support on Linux, 9.x is your only option! 10 doesn't list Linux as being supported, and likely never will. NOTE: The 9.x branch of reader has been EOL'd as of June 26, 2013.
