Two big-time issues from the Adobe 6 Reader readme file. Using eMail to Transfer a PDF file from a Windows computer system to a Mac OS X computer system If you transfer a PDF file from a Windows computer system to a Mac OS X computer system using email, the PDF file attachment may become corrupted. A scenario where this may occur is when using Outlook Express or Outlook 2000 on a Windows computer system and either Eudora or Entourage on a Mac OS X computer system. To avoid this problem, configure Outlook Express or Outlook 2000 on the Windows computer system to use uuencoding Using eMail to Transfer a PDF file from a Mac OS X computer system to a Windows computer system If you transfer a PDF file from a Mac OS X computer system using email to a Windows computer system, two PDF files may be received. A scenario where this may occur is when using either Eudora or Entourage on a Mac OS X computer system and Outlook Express on a Windows computer system. The first PDF attachment received contains a good copy of the PDF. The second PDF attachment is corrupt and should be ignored.