One of the biggest selling points of Reader XI was its expanded capability for collaboration. Unlike previous versions which often restricted commenting rights to paid Acrobat Pro users, Reader XI allowed users to add sticky notes, highlight text, and use drawing tools to mark up documents, provided the PDF security settings allowed it.
The Phantom Code
Over time, Reader XI stores user settings in a Protected Mode or preference cache. Corruption here prevents the application from initializing properly, resulting in a 11001 crash on startup. adobe reader xi 11001
