Hi,
I made some other tests.
I installed last version of Adobe Pro ( first ) and Acrobat Reader ( second ) with the tool Adobe Customization Wizard on a new terminal server. I changed the NTFS permission for Adobe Pro. Same problem, the user can't print a batch of email with pdf attachment.
I unistalled Acrobat Reader and installed FoxIt reader. It works, the user can print a batch of email.
I unistalled Foxit and reinstalled Acrobat Reader, same problem, the user can't print a batch of email with pdf attachment.
I unistalled Adobe Pro to only keep Acobat Reader and it works, the user can print a batch of email.
Thanks!