users have adobe acrobat reader 5.5 installed. users are starting to call and state they they receive some sort of error when trying to open a pdf that a customer has sent them. From what I understand if a pdf was created with a newer version of adobe acrobat ( 7 , 8, or 9?) then this pdf will not be able to be viewed with version 5x reader.
I need to find out specifics. Is it pdfs created in version 9 only or 8 and 9 that cannot be opened with 5x. Is 5x no longer supported by adobe? Why cant 5x open the newer pdfs? Whic version should we upgrade to to get around this problem? 7, 8, or 9?
I googled and when on adobes website but couldnt find anything specific