Sending Email in Adobe Reader XI with Outlook 2003

After upgrading the Acrobat Reader on our Terminal Servers with Windows Server 2008 R2 and Outlook 2003, it is not possible to send pdf from Acrobat Reader via E-Mail. When we select the function to send the document per mail (with the default mail program (Outlook)), the focus switches to Outlook (when started), but no mail with the pdf-file as attachment is opened.

Is Acrobat XI not compatible with Outlook 2003 anymore? Is it a problem only in terminal server environments?

Is anybody able to get this to work in a similar environment?

Thanks for any help.