Outlook 2010\2013 and PDF Pro 6.2\PDF 8.2 - they use the email function of PDF Pro to send a pdf, and the email message that opens does not include their default email signature.
This is a Microsoft issue where the signatures have to be added manually from the menu bar.
Multiple articles stating this is a known issue with MS Outlook and there is nothing we can do on our end.
http://support.microsoft.com/kb/2544665 - Messages that are created outside Outlook do not include the default Outlook email signature
"When a non-office program sends a document to Outlook to be attached, Outlook defaults to plain text format, leaving out the RTF signature. When an Office program sends a document to Outlook to be attached, Outlook creates an HTML format email, but still fails to insert the signature. There is no fix for this.
Additional KB from Microsoft.