I have a user with Adobe Acrobat 2017 Pro. Prior to upgrading to 64 bit Office everything worked fine. Since upgrading to 64 bit Office, no Excel files will convert to PDF or combine. All other 64 bit Office files convert just fine. The error message is "No pdf file was created because Adobe Acrobat encountered an unidentified error". This was first encountered trying to combine files, but it also will not convert single files. Any help would be amazing!