Adobe ReaderX 10 Feature
Adobe ReaderX 10.1.0 was released . Support for version 9 ended June 26, 2013, with the last available update being 10.1.0.
Adobe Reader X ends compatibility with Adobe Reader Extensions 5 and 6 which permit Adobe Reader client software to save changes to filled-in forms in PDFs. Adobe ReaderX 10 Extensions 6.1 and newer are still usable. Legacy PDFs will still be viewable, however they will open with the warning “This document enables Reader capabilities that are no longer enabled in this Reader version.”
The Adobe Acrobat 10 set also omitted the multiple document interface. Previous versions of Adobe Acrobat activated multiple PDF files in the same window (except for version 8 where MDI was only an alternative option and the default mode SDI). Acrobat 9 however, only uses the single document interface scheme, wherein each PDF file is activated in an instance of Adobe Acrobat.