For your work with PDF documents make sure that you have PDF IFilter installed on your machine. The versions of Adobe Reader and Adobe Acrobat 7.0.5 and higher already have this filter. Otherwise, download it from the official Adobe web-site.

For specific combinations of the Microsoft OS and PDF IFilter, an application error might appear after closing the program in case you have summarized a PDF document before.

Summarization results of PDF documents may be different depending on the PDF IFilter version installed on your machine.